Consolidated Statement Of Cash Flows
| Concept | 2024-01-01 to 2024-12-31 | 2024-01-01 to 2024-12-31 | As at 2024-12-31 | 2024-01-01 to 2024-12-31 | 2023-01-01 to 2023-12-31 | 2023-01-01 to 2023-12-31 | As at 2023-12-31 | 2023-01-01 to 2023-12-31 | As at 2022-12-31 | 
|---|---|---|---|---|---|---|---|---|---|
| Consolidated statement of cash flows | |||||||||
| Statement of cash flows | |||||||||
| Cash flows from operating activities | |||||||||
| Profit (loss) | 
                                                -1,332,852,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -1,332,852,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -1,332,852,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -1,489,602,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -1,489,602,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -1,489,602,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Impairment losses (reversal of impairment losses) | 
                                                56,376,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
                                                110,495,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Finance income | 
                                                -5,727,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
                                                -13,907,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Finance costs | 
                                                7,402,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
                                                9,374,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Subtotal | 
                                                -1,187,664,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
                                                -1,326,659,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Interest paid | 
                                                -7,411,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
                                                -9,280,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Net cash provided by (used in) operating activities | 
                                                -1,195,075,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
                                                -1,335,939,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Cash flows from investing activities | |||||||||
| Purchase of property, plant and equipment | 
                                                -49,735,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
                                                -66,287,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Net cash provided by (used in) investing activities | 
                                                -43,057,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
                                                -45,033,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Cash flows from financing activities | |||||||||
| Net cash provided by (used in) financing activities | 
                                                -88,273,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
                                                96,581,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Cash and cash equivalents | — | — | 
                                                1,454,908,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                2,767,639,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                4,048,969,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Effect of exchange rate changes on cash and cash equivalents | 
                                                13,674,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
                                                3,061,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — |