Balance Sheet
| Concept | As at 2024-06-30 | As at 2023-12-31 | 
|---|---|---|
| Balance sheet | ||
| Balance sheet | ||
| Assets | ||
| Current assets | ||
| Cash and deposits | 
                                                768,289,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                303,243,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Prepaid expenses | 
                                                76,839,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                49,119,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Merchandise and finished goods | 
                                                5,137,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                69,909,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Work in process | 
                                                109,559,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                82,730,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Advance payments to suppliers | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                59,064,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Raw materials and supplies | 
                                                94,713,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                86,606,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Allowance for doubtful accounts | 
                                                -320,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -565,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current assets | 
                                                1,551,349,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,562,520,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                11,074,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                744,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | ||
| Property, plant and equipment | ||
| Buildings | — | — | 
| Buildings, net | 
                                                1,860,722,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,910,565,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Land | 
                                                320,737,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                320,737,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Property, plant and equipment | 
                                                3,172,150,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,277,757,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Leased assets, net | 
                                                187,281,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                222,589,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Construction in progress | 
                                                118,694,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                121,840,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other, net | 
                                                279,208,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                274,132,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Machinery and equipment | — | — | 
| Machinery and equipment, net | 
                                                405,506,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                427,891,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | — | — | 
| Own-used assets | ||
| Leased assets | — | — | 
| Intangible assets | 
                                                43,755,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                40,689,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Intangible assets | ||
| Investments and other assets | ||
| Investments and other assets | 
                                                105,481,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                99,636,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | 
                                                3,321,387,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,418,083,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other assets | ||
| Assets | 
                                                4,872,736,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,980,604,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other assets | — | — | 
| Other assets | — | — | 
| Liabilities | ||
| Non-current liabilities | ||
| Non-current liabilities | 
                                                930,236,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                990,525,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Long-term borrowings | 
                                                717,451,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                738,958,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                682,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                974,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Lease liabilities | 
                                                122,631,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                161,460,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Asset retirement obligations | 
                                                89,471,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                89,131,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current liabilities | 
                                                1,012,227,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,128,904,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Short-term borrowings | 
                                                150,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                200,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Accounts payable - trade | 
                                                112,306,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                115,314,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Accounts payable - other | 
                                                218,324,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                271,329,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Income taxes payable | 
                                                45,945,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                82,106,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                63,723,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                11,324,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current liabilities | ||
| Current portion of long-term borrowings | 
                                                234,513,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                256,012,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Lease liabilities | 
                                                86,181,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                86,780,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Contract liabilities | 
                                                24,653,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                7,251,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Provisions | ||
| Provision for bonuses | 
                                                76,522,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                76,008,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Provision for bonuses for directors (and other officers) | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                22,572,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | 
                                                1,942,463,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,119,429,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other liabilities | — | — | 
| Other liabilities | — | — | 
| Liabilities and net assets | ||
| Shareholders' equity | 
                                                2,930,272,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,861,174,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Share capital | 
                                                817,533,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                807,609,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Capital surplus | 
                                                804,533,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                794,609,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Retained earnings | 
                                                1,308,608,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,259,359,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Treasury shares | 
                                                -403,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -403,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | 
                                                2,930,272,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,861,174,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities and net assets | 
                                                4,872,736,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,980,604,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | ||
| Shareholders' equity | ||
| Capital surplus | ||
| Retained earnings |