Notes - Segment Information, Etc.
| Concept | 2024-01-01 to 2024-12-31 | 2024-01-01 to 2024-12-31 | 2024-01-01 to 2024-12-31 | 2024-01-01 to 2024-12-31 | 2024-01-01 to 2024-12-31 | 2023-01-01 to 2023-12-31 | 2023-01-01 to 2023-12-31 | 2023-01-01 to 2023-12-31 | 2023-01-01 to 2023-12-31 | 2023-01-01 to 2023-12-31 | 
|---|---|---|---|---|---|---|---|---|---|---|
| Notes - Segment information, etc. | ||||||||||
| Segment information | ||||||||||
| Disclosure of sales, profit (loss), asset, liability, and other items for each reportable segment | ||||||||||
| Sales | ||||||||||
| Revenues from external customers | 
                                                2,094,946,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                132,076,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,962,869,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,094,946,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,330,928,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,330,928,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                64,575,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,266,353,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Transactions with other segments | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,760,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                16,200,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                18,960,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -18,960,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,760,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,760,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -2,760,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other items | ||||||||||
| Depreciation | 
                                                16,901,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                10,378,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,006,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                15,384,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,516,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                16,601,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                18,768,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                10,512,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,167,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,088,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Increase in property, plant and equipment and intangible assets | 
                                                31,846,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                24,146,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                10,287,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                34,434,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -2,587,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                43,844,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,690,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                10,485,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -42,153,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                33,359,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |