Balance Sheet
| Concept | As at 2024-09-30 | As at 2024-03-31 | 
|---|---|---|
| Balance sheet | ||
| Balance sheet | ||
| Assets | ||
| Current assets | ||
| Cash and deposits | 
                                                1,763,635,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,099,743,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Securities | 
                                                1,500,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,300,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Accounts receivable - trade | 
                                                558,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Prepaid expenses | 
                                                51,112,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                27,297,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Advance payments to suppliers | 
                                                8,580,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                12,773,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Supplies | 
                                                2,463,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,274,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                571,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,108,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current assets | 
                                                3,353,964,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,506,706,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | ||
| Property, plant and equipment | ||
| Property, plant and equipment | 
                                                1,226,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                0
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | 
                                                39,437,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                40,550,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | ||
| Non-current assets | 
                                                40,664,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                40,551,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other assets | ||
| Assets | 
                                                3,394,628,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,547,257,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other assets | — | — | 
| Other assets | — | — | 
| Liabilities | ||
| Current liabilities | ||
| Accounts payable - other | 
                                                72,358,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                96,824,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Accrued expenses | 
                                                13,112,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                12,397,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Income taxes payable | 
                                                13,044,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,210,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                10,040,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                45,377,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current liabilities | 
                                                108,555,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                155,810,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | 
                                                108,555,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                155,810,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other liabilities | — | — | 
| Other liabilities | — | — | 
| Liabilities and net assets | ||
| Shareholders' equity | 
                                                3,284,215,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,387,409,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Share capital | 
                                                252,004,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                63,648,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Capital surplus | 
                                                4,536,356,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,348,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Retained earnings | 
                                                -1,504,144,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -1,024,237,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Treasury shares | 
                                                -1,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -1,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Share acquisition rights | 
                                                1,857,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,038,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | 
                                                3,286,072,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,391,447,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities and net assets | 
                                                3,394,628,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,547,257,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | ||
| Shareholders' equity | ||
| Capital surplus | ||
| Retained earnings |