Key Financial Data Of Reporting Company
| Concept | As at 2024-04-30 | 2024-02-01 to 2024-04-30 | As at 2024-01-31 | 2023-02-01 to 2024-01-31 | As at 2023-04-30 | 2023-02-01 to 2023-04-30 | 
|---|---|---|---|---|---|---|
| Key financial data of reporting company | ||||||
| Business results of reporting company | ||||||
| Net sales | — | 
                                                82,120,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                310,965,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                74,839,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Ordinary profit (loss) | — | 
                                                -8,402,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -76,376,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -20,827,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Profit (loss) | — | 
                                                -9,874,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -85,810,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -20,700,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Equity in earnings (losses) of affiliates if equity method is applied | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Share capital | 
                                                593,175,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                593,175,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                531,350,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Total number of issued shares | 
                                                4,815,491
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | — | 
                                                4,815,491
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | — | 
                                                4,352,794
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | — | 
| Net assets | 
                                                398,237,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                408,111,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                349,681,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Total assets | 
                                                487,648,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                513,342,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                515,348,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Dividend paid per share | — |  | — |  | — |  | 
| Basic earnings (loss) per share | — | 
                                                -2.05
                                                
                                             | — | 
                                                -18.47
                                                
                                             | — | 
                                                -4.85
                                                
                                             | 
| Diluted earnings per share | — |  | — |  | — |  | 
| Equity-to-asset ratio | 
                                                0.814
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                0.793
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                0.676
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — |