Semi-Annual Balance Sheet
| Concept | As at 2024-09-30 | As at 2024-03-31 | 
|---|---|---|
| Semi-annual balance sheet | ||
| Balance sheet | ||
| Assets | ||
| Current assets | ||
| Cash and deposits | 
                                                1,539,394,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,057,360,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                107,502,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                123,594,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current assets | 
                                                1,646,927,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,180,960,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | ||
| Property, plant and equipment | ||
| Property, plant and equipment | 
                                                0
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                0
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Intangible assets | ||
| Intangible assets | 
                                                0
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                0
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | ||
| Investments and other assets | 
                                                49,296,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                49,296,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | 
                                                49,296,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                49,296,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Assets | 
                                                1,696,224,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,230,257,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | ||
| Current liabilities | ||
| Accounts payable - trade | 
                                                15,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                20,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Income taxes payable | 
                                                12,436,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                12,815,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                60,302,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                65,675,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current liabilities | 
                                                397,755,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                191,011,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current liabilities | ||
| Non-current liabilities | 
                                                64,361,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                60,258,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Asset retirement obligations | 
                                                22,694,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                22,648,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                0
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                0
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | 
                                                462,117,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                251,270,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other liabilities | — | — | 
| Provision for retirement benefits | 
                                                41,667,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                37,610,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other liabilities | — | — | 
| Net assets | ||
| Shareholders' equity | ||
| Share capital | 
                                                1,047,921,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                650,661,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Capital surplus | ||
| Capital surplus | 
                                                3,356,455,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,959,195,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Retained earnings | ||
| Retained earnings | 
                                                -3,192,452,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -2,653,715,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Treasury shares | 
                                                0
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                0
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Shareholders' equity | 
                                                1,211,925,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                956,141,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | 
                                                1,234,107,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                978,987,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Share acquisition rights | 
                                                22,182,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                22,845,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities and net assets | 
                                                1,696,224,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,230,257,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |