Semi-Annual Balance Sheet
| Concept | As at 2024-03-31 | As at 2023-12-31 | 
|---|---|---|
| Semi-annual balance sheet | ||
| Balance sheet | ||
| Assets | ||
| Current assets | ||
| Cash and deposits | 
                                                293,588,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                338,717,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                11,941,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,551,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current assets | 
                                                11,144,789,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                11,462,602,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Accounts receivable - other | 
                                                620,413,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                589,330,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Prepaid expenses | 
                                                65,314,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                25,094,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | ||
| Property, plant and equipment | ||
| Property, plant and equipment | 
                                                380,145,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                401,611,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Intangible assets | ||
| Intangible assets | 
                                                6,323,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,975,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | ||
| Investments and other assets | 
                                                1,122,355,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                945,688,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                1,122,355,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                945,688,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | 
                                                1,508,825,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,350,274,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Assets | 
                                                12,653,615,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                12,812,876,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | ||
| Current liabilities | ||
| Accounts payable - trade | 
                                                912,529,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                944,454,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Income taxes payable | 
                                                154,899,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                205,458,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                76,328,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                10,645,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current liabilities | 
                                                2,747,846,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,739,009,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Accounts payable - other | 
                                                880,757,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                909,809,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current liabilities | ||
| Non-current liabilities | 
                                                101,976,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                101,412,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                21,741,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                21,741,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | 
                                                2,849,822,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,840,421,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other liabilities | — | — | 
| Provision for bonuses | 
                                                29,199,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                143,914,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Deferred tax liabilities | 
                                                80,234,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                79,670,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other liabilities | — | — | 
| Net assets | ||
| Shareholders' equity | ||
| Share capital | 
                                                1,491,350,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,491,350,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Capital surplus | ||
| Capital surplus | 
                                                1,749,600,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,749,600,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Retained earnings | ||
| Retained earnings | 
                                                6,560,530,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,730,468,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Treasury shares | 
                                                -7,005,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -7,005,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Shareholders' equity | 
                                                9,794,474,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                9,964,412,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation and translation adjustments | ||
| Valuation difference on available-for-sale securities | 
                                                9,318,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                8,042,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation and translation adjustments | 
                                                9,318,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                8,042,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | 
                                                9,803,793,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                9,972,454,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities and net assets | 
                                                12,653,615,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                12,812,876,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |