Key Financial Data Of Group
| Concept | As at 2024-06-30 | 2024-01-01 to 2024-06-30 | 2023-01-01 to 2023-12-31 | As at 2023-12-31 | As at 2023-06-30 | 2023-01-01 to 2023-06-30 | 
|---|---|---|---|---|---|---|
| Key financial data of group | ||||||
| Business results of group | ||||||
| Ordinary profit (loss) | — | 
                                                -682,206,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -1,127,594,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -832,341,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | 
                                                5,006,531,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                5,687,452,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,933,601,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Total assets | 
                                                5,087,823,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                5,778,946,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,132,242,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Basic earnings (loss) per share | — | 
                                                -15.79
                                                
                                             | 
                                                -27.25
                                                
                                             | — | — | 
                                                -21.03
                                                
                                             | 
| Diluted earnings per share | — |  |  | — | — |  | 
| Equity-to-asset ratio | 
                                                0.983
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                0.983
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.966
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
| Net cash provided by (used in) operating activities | — | 
                                                -611,479,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -873,076,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -509,179,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net cash provided by (used in) investing activities | — | 
                                                557,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -5,316,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -5,316,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net cash provided by (used in) financing activities | — | 
                                                2,500,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,913,086,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                1,947,090,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Cash and cash equivalents | 
                                                4,947,268,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                5,555,691,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,953,593,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — |