Balance Sheet
| Concept | As at 2024-09-30 | As at 2024-03-31 | 
|---|---|---|
| Balance sheet | ||
| Balance sheet | ||
| Assets | ||
| Current assets | ||
| Cash and deposits | 
                                                3,364,588,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,749,726,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Prepaid expenses | 
                                                184,814,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                107,483,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Supplies | 
                                                149,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                169,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Work in process | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                496,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Advance payments to suppliers | 
                                                14,179,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                11,176,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Allowance for doubtful accounts | 
                                                -16,517,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -15,298,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current assets | 
                                                6,376,477,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,301,213,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                135,235,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                127,893,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | 
                                                907,097,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                872,923,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Property, plant and equipment | 
                                                99,501,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                83,052,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Leased assets, net | 
                                                82,028,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                65,120,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Intangible assets | 
                                                540,747,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                509,727,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                3,681,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,499,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | 
                                                266,849,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                280,143,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investment securities | 
                                                30,746,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                34,834,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Long-term prepaid expenses | 
                                                3,572,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,166,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Deferred tax assets | 
                                                32,599,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                39,347,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                67,768,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                75,564,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other assets | — | — | 
| Non-current assets | ||
| Property, plant and equipment | ||
| Own-used assets | ||
| Leased assets | — | — | 
| Tools, furniture and fixtures | — | — | 
| Tools, furniture and fixtures, net | 
                                                7,951,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                7,959,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Vehicles | — | — | 
| Vehicles, net | 
                                                743,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                706,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Intangible assets | ||
| Other intangible assets | ||
| Investments and other assets | ||
| Other assets | ||
| Assets | 
                                                7,283,575,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                7,174,136,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other assets | — | — | 
| Other assets | — | — | 
| Liabilities and net assets | ||
| Non-current liabilities | 
                                                1,400,521,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,499,661,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Long-term borrowings | 
                                                1,246,978,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,332,982,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Deferred tax liabilities | 
                                                106,969,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                103,198,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                14,192,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                13,424,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Lease liabilities | 
                                                32,381,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                45,786,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Asset retirement obligations | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,269,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current liabilities | 
                                                2,702,845,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,603,834,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Accounts payable - trade | 
                                                1,165,677,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,149,401,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Accounts payable - other | 
                                                169,671,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                236,981,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Accrued expenses | 
                                                530,593,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                224,650,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Income taxes payable | 
                                                88,855,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                299,317,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Accrued consumption taxes | 
                                                249,977,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                276,189,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Deposits received | 
                                                112,672,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                69,942,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                31,775,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                20,845,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | 
                                                4,103,366,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,103,495,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Shareholders' equity | 
                                                2,791,536,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,730,484,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Share capital | 
                                                1,112,183,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,112,183,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Capital surplus | 
                                                1,062,126,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,062,126,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Retained earnings | 
                                                617,227,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                556,174,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation and translation adjustments | 
                                                122,831,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                79,042,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation difference on available-for-sale securities | 
                                                633,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,470,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Share acquisition rights | 
                                                73,444,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                68,820,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | 
                                                3,180,208,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,070,641,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities and net assets | 
                                                7,283,575,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                7,174,136,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | ||
| Current liabilities | ||
| Lease liabilities | 
                                                107,272,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                95,645,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Deposits received | ||
| Contract liabilities | 
                                                74,342,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                58,851,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current liabilities | ||
| Other liabilities | — | — | 
| Other liabilities | — | — | 
| Net assets | ||
| Shareholders' equity | ||
| Capital surplus | ||
| Retained earnings | ||
| Valuation and translation adjustments |