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 | ||||||
| Net sales | — | 
                                                263,728,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                682,464,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                358,889,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Ordinary profit (loss) | — | 
                                                -563,345,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -1,217,240,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -662,139,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | 
                                                1,070,531,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                1,157,723,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,144,629,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Total assets | 
                                                1,557,439,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                1,751,454,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,685,551,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Basic earnings (loss) per share | — | 
                                                -10.21
                                                
                                             | 
                                                -24.62
                                                
                                             | — | — | 
                                                -13.70
                                                
                                             | 
| Diluted earnings per share | — |  |  | — | — |  | 
| Equity-to-asset ratio | 
                                                0.680
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                0.651
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.672
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
| Net cash provided by (used in) operating activities | — | 
                                                -677,388,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -1,069,192,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -595,281,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net cash provided by (used in) investing activities | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                173,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                82,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net cash provided by (used in) financing activities | — | 
                                                455,490,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                667,303,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                113,359,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Cash and cash equivalents | 
                                                1,103,656,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                1,325,554,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,245,431,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — |