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 | 
                                                1,932,532,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,787,827,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                620,707,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                149,904,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current assets | 
                                                5,237,128,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,874,631,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | ||
| Property, plant and equipment | ||
| Property, plant and equipment | 
                                                1,305,880,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                908,517,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                806,831,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                375,184,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Accumulated depreciation | 
                                                -168,991,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -151,754,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other, net | 
                                                637,839,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                223,429,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Intangible assets | ||
| Intangible assets | 
                                                190,205,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                209,221,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Goodwill | 
                                                129,253,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                145,409,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Software | 
                                                15,962,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                18,821,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | ||
| Investments and other assets | 
                                                477,312,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                472,902,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Deferred tax assets | 
                                                56,512,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                49,194,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                56,424,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                56,580,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | 
                                                1,973,398,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,590,640,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Assets | 
                                                7,210,526,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                7,465,272,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | ||
| Current liabilities | ||
| Accounts payable - trade | 
                                                637,896,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,578,157,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Short-term borrowings | 
                                                850,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                650,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Income taxes payable | 
                                                122,358,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                322,467,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                869,679,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                278,299,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current liabilities | 
                                                2,868,929,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,179,628,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current liabilities | ||
| Non-current liabilities | 
                                                733,106,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                810,039,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Long-term borrowings | 
                                                437,229,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                515,061,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Asset retirement obligations | 
                                                295,877,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                294,978,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | 
                                                3,602,036,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,989,667,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other liabilities | — | — | 
| Provision for bonuses | 
                                                52,511,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other liabilities | — | — | 
| Net assets | ||
| Share capital | 
                                                807,399,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                807,359,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Shareholders' equity | ||
| Capital surplus | ||
| Capital surplus | 
                                                787,399,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                787,359,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Retained earnings | ||
| Retained earnings | 
                                                1,964,654,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,839,896,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Shareholders' equity | 
                                                3,559,453,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,434,615,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation and translation adjustments | ||
| Valuation and translation adjustments | 
                                                30,996,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                22,948,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | 
                                                3,608,490,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,475,604,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Share acquisition rights | 
                                                18,040,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                18,040,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities and net assets | 
                                                7,210,526,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                7,465,272,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |