Key Financial Data Of Reporting Company
| Concept | 2024-02-01 to 2024-07-31 | As at 2024-07-31 | As at 2024-01-31 | 2023-02-01 to 2024-01-31 | As at 2023-07-31 | 2023-02-01 to 2023-07-31 | 
|---|---|---|---|---|---|---|
| Key financial data of reporting company | ||||||
| Business results of reporting company | ||||||
| Net sales | 
                                                162,189,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                310,965,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                122,212,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Ordinary profit (loss) | 
                                                -18,129,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -76,376,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -65,240,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Profit (loss) | 
                                                -20,424,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -85,810,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -65,181,000
                                                
                                                    
                                                        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
                                                    
                                                
                                             | — | 
                                                593,175,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Total number of issued shares | — | 
                                                4,815,491
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                4,815,491
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | — | 
                                                4,815,491
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | — | 
| Net assets | — | 
                                                387,686,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                408,111,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                428,740,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Total assets | — | 
                                                479,786,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                513,342,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                514,439,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Dividend paid per share |  | — | — |  | — |  | 
| Basic earnings (loss) per share | 
                                                -4.24
                                                
                                             | — | — | 
                                                -18.47
                                                
                                             | — | 
                                                -14.57
                                                
                                             | 
| Diluted earnings per share |  | — | — |  | — |  | 
| Equity-to-asset ratio | — | 
                                                0.806
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.793
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                0.831
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
| Net cash provided by (used in) operating activities | 
                                                -10,753,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -72,561,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -29,705,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net cash provided by (used in) investing activities | 
                                                -23,523,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -53,957,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -19,870,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net cash provided by (used in) financing activities | 
                                                -227,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                67,834,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                66,783,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Cash and cash equivalents | — | 
                                                295,710,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                330,096,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                405,975,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — |