Quarterly Balance Sheet
| Concept | As at 2024-03-31 | As at 2023-12-31 | 
|---|---|---|
| Quarterly balance sheet | ||
| Balance sheet | ||
| Assets | ||
| Current assets | ||
| Cash and deposits | 
                                                187,300,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                284,139,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                105,176,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                77,666,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current assets | 
                                                748,251,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                669,648,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | ||
| Property, plant and equipment | 
                                                144,201,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                167,129,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Property, plant and equipment | ||
| Buildings | 
                                                64,815,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                46,731,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Land | 
                                                51,728,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                53,299,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Construction in progress | 
                                                21,605,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                59,753,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                6,051,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                7,344,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Intangible assets | 
                                                1,441,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,604,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Intangible assets | ||
| Software | 
                                                1,377,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,540,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                64,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                64,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | 
                                                181,679,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                186,322,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | ||
| Shares of subsidiaries and associates | 
                                                66,091,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                74,158,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                20,668,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                20,973,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | 
                                                327,322,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                355,056,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Assets | 
                                                1,075,574,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,024,704,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | ||
| Current liabilities | ||
| Short-term borrowings | 
                                                76,840,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                79,651,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Income taxes payable | 
                                                49,855,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                40,665,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                5,404,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                12,659,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current liabilities | 
                                                783,903,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                804,398,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current liabilities | ||
| Long-term borrowings | 
                                                65,331,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                72,351,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                20,106,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                306,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current liabilities | 
                                                90,109,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                77,330,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | 
                                                874,013,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                881,728,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | ||
| Shareholders' equity | ||
| Share capital | 
                                                936,556,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                936,556,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Capital surplus | 
                                                941,904,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                941,904,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Retained earnings | 
                                                -1,724,527,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -1,781,973,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Shareholders' equity | 
                                                153,934,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                96,488,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Share acquisition rights | 
                                                27,555,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                27,555,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | 
                                                201,560,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                142,975,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities and net assets | 
                                                1,075,574,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,024,704,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |