Key Financial Data Of Reporting Company
| Concept | As at 2023-12-31 | 2023-10-01 to 2023-12-31 | 2023-04-01 to 2023-12-31 | As at 2023-03-31 | 2022-04-01 to 2023-03-31 | 2022-04-01 to 2022-12-31 | As at 2022-12-31 | 2022-10-01 to 2022-12-31 | 
|---|---|---|---|---|---|---|---|---|
| Key financial data of reporting company | ||||||||
| Business results of reporting company | ||||||||
| Net sales | — | — | 
                                                67,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                5,280,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,229,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Ordinary profit (loss) | — | — | 
                                                -947,580,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -1,473,774,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -1,223,957,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Profit (loss) | — | — | 
                                                -953,765,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -1,485,633,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -1,225,382,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Equity in earnings (losses) of affiliates if equity method is applied | — | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Share capital | 
                                                439,412,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                362,185,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                362,025,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Total number of issued shares | 
                                                64,841,300
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | — | — | 
                                                62,891,200
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | — | — | 
                                                62,888,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | — | 
| Net assets | 
                                                772,753,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                1,567,541,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                1,827,471,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Total assets | 
                                                1,428,572,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                1,701,444,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                1,974,925,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Dividend paid per share | — | — |  | — |  |  | — | — | 
| Basic earnings (loss) per share | — | 
                                                -6.32
                                                
                                             | 
                                                -15.14
                                                
                                             | — | 
                                                -24.90
                                                
                                             | 
                                                -20.91
                                                
                                             | — | 
                                                -6.73
                                                
                                             | 
| Diluted earnings per share | — | — |  | — |  |  | — | — | 
| Equity-to-asset ratio | 
                                                0.524
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                0.909
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                0.915
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — |