Key Financial Data Of Group
| Concept | 2024-01-01 to 2024-06-30 | As at 2024-06-30 | 2023-01-01 to 2023-12-31 | As at 2023-12-31 | 2023-01-01 to 2023-06-30 | As at 2023-06-30 | 
|---|---|---|---|---|---|---|
| Key financial data of group | ||||||
| Business results of group | ||||||
| Ordinary profit (loss) | 
                                                -780,152,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -2,351,788,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -995,474,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Profit (loss) attributable to owners of parent | 
                                                -780,946,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -2,391,821,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -1,033,228,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Comprehensive income | 
                                                -772,145,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -2,400,981,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -1,034,904,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net assets | — | 
                                                1,112,727,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                1,380,422,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                2,532,501,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Total assets | — | 
                                                1,409,675,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                2,025,925,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                2,855,661,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Basic earnings (loss) per share | 
                                                -21.98
                                                
                                             | — | 
                                                -77.24
                                                
                                             | — | 
                                                -34.24
                                                
                                             | — | 
| Diluted earnings per share |  | — |  | — |  | — | 
| Equity-to-asset ratio | — | 
                                                0.778
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                0.668
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                0.880
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
| Net cash provided by (used in) operating activities | 
                                                -931,410,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -2,254,466,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -979,332,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net cash provided by (used in) investing activities | 
                                                -188,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -39,699,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -37,830,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net cash provided by (used in) financing activities | 
                                                256,143,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                1,216,451,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                615,005,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Cash and cash equivalents | — | 
                                                1,278,281,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                1,883,437,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                2,591,391,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |