Consolidated Balance Sheet
| Concept | As at 2023-12-31 | 
|---|---|
| Consolidated balance sheet | |
| Balance sheet | |
| Assets | |
| Non-current assets | 
                                                565,887,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | 
                                                41,577,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current assets | |
| Cash and deposits | 
                                                5,613,767,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Securities | 
                                                19,663,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Accounts receivable - trade | 
                                                94,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Inventories | 
                                                4,082,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                29,611,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current assets | 
                                                5,667,221,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | |
| Property, plant and equipment | |
| Property, plant and equipment | 
                                                517,370,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Intangible assets | |
| Intangible assets | 
                                                6,939,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | |
| Assets | 
                                                6,233,108,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | |
| Current liabilities | |
| Deposits received | 
                                                52,773,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Accounts payable - other | 
                                                70,769,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Income taxes payable | 
                                                34,257,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current liabilities | 
                                                157,801,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current liabilities | |
| Deferred tax liabilities | 
                                                6,605,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current liabilities | 
                                                35,025,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Asset retirement obligations | 
                                                28,419,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | 
                                                192,826,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities and net assets | |
| Shareholders' equity | 
                                                6,031,024,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Share capital | 
                                                1,559,015,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Capital surplus | 
                                                6,457,760,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Retained earnings | 
                                                -1,973,914,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Treasury shares | 
                                                -11,836,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Share acquisition rights | 
                                                9,256,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | 
                                                6,040,281,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities and net assets | 
                                                6,233,108,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | |
| Shareholders' equity |