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 | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,000,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                1,000,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Ordinary profit (loss) | — | 
                                                -422,670,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                344,184,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                651,026,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | 
                                                2,678,263,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                3,104,768,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,851,036,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Total assets | 
                                                2,789,266,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                3,313,902,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,225,630,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Basic earnings (loss) per share | — | 
                                                -36.75
                                                
                                             | 
                                                25.42
                                                
                                             | — | — | 
                                                52.11
                                                
                                             | 
| Diluted earnings per share | — |  | 
                                                23.07
                                                
                                             | — | — |  | 
| Equity-to-asset ratio | 
                                                0.960
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                0.937
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.832
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
| Net cash provided by (used in) operating activities | — | 
                                                -562,445,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                454,425,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                848,528,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net cash provided by (used in) investing activities | — | 
                                                -9,306,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -11,099,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -9,781,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net cash provided by (used in) financing activities | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,486,235,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -90,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Cash and cash equivalents | 
                                                2,694,656,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                3,266,408,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,175,504,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — |