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 | 
                                                636,235,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                636,235,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                636,235,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,625,889,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                918,239,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,625,889,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                707,650,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Transactions with other segments | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other items | ||||||||||
| Depreciation | 
                                                23,330,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                31,245,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                31,245,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                7,914,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                35,612,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                23,298,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                35,612,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                12,313,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Increase in property, plant and equipment and intangible assets | 
                                                8,662,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                17,828,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                17,828,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                9,166,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                44,550,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                39,369,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                44,550,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,180,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |