Quarterly Consolidated Balance Sheet
| Concept | As at 2025-03-31 | 
|---|---|
| Quarterly consolidated balance sheet | |
| Balance sheet | |
| Assets | |
| Current assets | |
| Cash and deposits | 
                                                1,431,008,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Work in process | 
                                                60,483,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Raw materials and supplies | 
                                                7,925,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                131,689,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Allowance for doubtful accounts | 
                                                -17,721,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current assets | 
                                                5,095,826,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | |
| Property, plant and equipment | 
                                                2,015,155,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Property, plant and equipment | |
| Buildings and structures | 
                                                788,853,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Machinery, equipment and vehicles | 
                                                1,298,505,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Land | 
                                                1,066,627,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Leased assets | 
                                                473,524,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Construction in progress | 
                                                9,860,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Accumulated depreciation | 
                                                -1,999,177,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Intangible assets | |
| Other | 
                                                4,096,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Intangible assets | 
                                                4,096,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | 
                                                409,678,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | |
| Investment securities | 
                                                20,522,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                115,780,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Allowance for doubtful accounts | 
                                                -47,905,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | 
                                                2,428,930,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Deferred assets | 
                                                12,004,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Deferred assets | |
| Organization expenses | 
                                                4,794,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Bond issuance costs | 
                                                7,210,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Assets | 
                                                7,536,761,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | |
| Current liabilities | |
| Short-term borrowings | 
                                                1,150,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Income taxes payable | 
                                                162,532,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                139,409,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current liabilities | 
                                                3,010,393,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current liabilities | |
| Bonds payable | 
                                                550,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Long-term borrowings | 
                                                319,420,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Retirement benefit liability | 
                                                103,476,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Asset retirement obligations | 
                                                33,667,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                1,190,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current liabilities | 
                                                1,320,037,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | 
                                                4,330,431,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | |
| Shareholders' equity | |
| Share capital | 
                                                50,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Capital surplus | 
                                                1,701,328,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Retained earnings | 
                                                1,622,082,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Shareholders' equity | 
                                                3,373,410,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation and translation adjustments | |
| Valuation difference on available-for-sale securities | 
                                                9,084,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Revaluation reserve for land | 
                                                -176,165,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation and translation adjustments | 
                                                -167,080,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | 
                                                3,206,330,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities and net assets | 
                                                7,536,761,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |