Statement Of Cash Flows
| Concept | 2023-04-01 to 2024-03-31 | As at 2024-03-31 | 2023-04-01 to 2024-03-31 | As at 2023-03-31 | 2022-04-01 to 2023-03-31 | 
|---|---|---|---|---|---|
| Statement of cash flows | |||||
| Statement of cash flows | |||||
| Cash flows from operating activities | |||||
| Profit (loss) before income taxes | 
                                                -629,953,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -628,081,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -449,878,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Depreciation | 
                                                70,102,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
| Decrease (increase) in trade receivables | 
                                                2,520,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
| Decrease (increase) in inventories | 
                                                3,695,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
| Subtotal | 
                                                -448,496,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
| Other, net | 
                                                -4,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
| Income taxes paid | 
                                                -2,901,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
| Net cash provided by (used in) operating activities | 
                                                -451,060,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
| Interest and dividends received | 
                                                337,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
| Cash flows from operating activities | |||||
| Increase (decrease) in accounts payable - other | 
                                                35,104,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
| Cash flows from operating activities | |||||
| Cash flows from investing activities | |||||
| Purchase of property, plant and equipment | 
                                                -23,770,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
| Net cash provided by (used in) investing activities | 
                                                -34,998,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
| Cash flows from facilities maintenance and investing activities | |||||
| Cash flows from financing activities | |||||
| Proceeds from issuance of shares | 
                                                2,842,027,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
| Purchase of treasury shares | 
                                                -268,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
| Net cash provided by (used in) financing activities | 
                                                3,125,418,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
| Effect of exchange rate change on cash and cash equivalents | 
                                                1,014,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
| Net increase (decrease) in cash and cash equivalents | 
                                                2,640,373,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
| Cash and cash equivalents | — | 
                                                5,582,270,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                2,941,896,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — |