Balance Sheet
| Concept | As at 2024-09-30 | As at 2024-03-31 | 
|---|---|---|
| Balance sheet | ||
| Balance sheet | ||
| Assets | ||
| Current assets | ||
| Cash and deposits | 
                                                3,443,897,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,755,526,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Accounts receivable - trade | 
                                                733,786,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                718,892,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Prepaid expenses | 
                                                50,212,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                55,372,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Supplies | 
                                                959,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,109,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Work in process | 
                                                1,109,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                412,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                10,358,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                10,091,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current assets | 
                                                4,251,048,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,541,404,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | ||
| Property, plant and equipment | 
                                                1,251,645,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,237,125,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Buildings, net | 
                                                272,832,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                265,712,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Land | 
                                                968,059,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                968,059,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Buildings | 
                                                544,436,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                530,859,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Accumulated depreciation | 
                                                -271,604,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -265,146,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Leased assets, net | 
                                                86,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                606,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Structures | 
                                                6,677,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,677,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Accumulated depreciation | 
                                                -6,206,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -6,172,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Structures, net | 
                                                471,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                505,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Property, plant and equipment | ||
| Own-used assets | ||
| Leased assets | 
                                                5,202,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,202,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Accumulated depreciation | 
                                                -5,115,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -4,595,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Tools, furniture and fixtures | 
                                                39,248,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                30,606,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Accumulated depreciation | 
                                                -29,053,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -28,366,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Tools, furniture and fixtures, net | 
                                                10,194,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,240,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Intangible assets | ||
| Intangible assets | 
                                                9,792,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                13,273,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Software | 
                                                8,290,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                11,768,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                1,502,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,505,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other intangible assets | ||
| Investments and other assets | ||
| Investments and other assets | 
                                                355,103,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                352,217,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Long-term prepaid expenses | 
                                                37,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                64,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Deferred tax assets | 
                                                328,890,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                326,019,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                27,976,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                27,933,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Allowance for doubtful accounts | 
                                                -1,800,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -1,800,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | 
                                                1,616,541,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,602,616,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other assets | — | — | 
| Other assets | ||
| Assets | 
                                                5,867,590,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,144,020,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other assets | — | — | 
| Other assets | — | — | 
| Liabilities | ||
| Non-current liabilities | ||
| Non-current liabilities | 
                                                478,862,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                697,828,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Provision for retirement benefits | 
                                                465,299,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                452,400,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Provisions | ||
| Provision for retirement benefits for directors (and other officers) | 
                                                13,562,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                245,427,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current liabilities | 
                                                1,589,707,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,635,621,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Short-term borrowings | 
                                                600,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                600,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Accounts payable - other | 
                                                16,285,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                79,572,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Accrued expenses | 
                                                401,113,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                371,471,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Income taxes payable | 
                                                98,225,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                101,038,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Deposits received | 
                                                17,904,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                65,924,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                97,858,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                101,174,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current liabilities | ||
| Lease liabilities | 
                                                95,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                667,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Deposits received | ||
| Provision for bonuses | 
                                                358,225,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                315,773,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Provisions | ||
| Liabilities | 
                                                2,068,570,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,333,450,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other liabilities | — | — | 
| Other liabilities | — | — | 
| Liabilities and net assets | ||
| Shareholders' equity | 
                                                3,799,020,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,810,570,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Share capital | 
                                                377,525,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                377,525,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Capital surplus | 
                                                337,525,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                337,525,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Legal capital surplus | 
                                                337,525,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                337,525,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Retained earnings | 
                                                3,138,064,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,149,602,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other retained earnings | — | — | 
| Retained earnings brought forward | 
                                                2,988,064,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,999,602,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Treasury shares | 
                                                -54,093,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -54,081,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | 
                                                3,799,020,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,810,570,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities and net assets | 
                                                5,867,590,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,144,020,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | ||
| Shareholders' equity | ||
| Capital surplus | ||
| Retained earnings | ||
| Other retained earnings |