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 | 
                                                255,537,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,303,482,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,559,020,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,559,020,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,523,120,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,316,002,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                207,118,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,523,120,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Transactions with other segments | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other items | ||||||||||
| Depreciation | 
                                                304,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                14,541,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                9,240,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                24,086,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                14,845,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                7,744,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                27,190,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                12,079,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                7,367,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                19,446,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Increase in property, plant and equipment and intangible assets | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                36,785,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                21,337,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                58,122,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                36,785,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                8,077,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                339,929,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                21,107,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                310,744,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                331,851,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |