Quarterly Consolidated Statement Of Cash Flows
| Concept | As at 2024-12-31 | 2024-07-01 to 2024-12-31 | As at 2024-06-30 | 2023-07-01 to 2023-12-31 | As at 2023-12-31 | As at 2023-06-30 | 
|---|---|---|---|---|---|---|
| Quarterly consolidated statement of cash flows | ||||||
| Statement of cash flows | ||||||
| Cash flows from operating activities | ||||||
| Profit (loss) before income taxes | — | 
                                                104,788,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -36,649,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Depreciation | — | 
                                                2,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                15,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Interest expenses | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                17,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Foreign exchange losses (gains) | — | 
                                                20,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                1,091,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Decrease (increase) in inventories | — | 
                                                -14,260,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -30,199,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Increase (decrease) in trade payables | — | 
                                                132,861,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                44,767,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Other, net | — | 
                                                -46,019,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -34,438,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Subtotal | — | 
                                                62,136,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -133,012,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Interest paid | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -17,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net cash provided by (used in) operating activities | — | 
                                                23,350,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -133,553,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Cash flows from investing activities | ||||||
| Net cash provided by (used in) investing activities | — | 
                                                -2,252,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -1,309,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Cash flows from financing activities | ||||||
| Repayments of long-term borrowings | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -104,993,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Proceeds from issuance of shares | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                418,001,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Purchase of treasury shares | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -147,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net cash provided by (used in) financing activities | — | 
                                                301,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                348,385,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Effect of exchange rate change on cash and cash equivalents | — | 
                                                -20,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -143,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net increase (decrease) in cash and cash equivalents | — | 
                                                21,379,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                213,379,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Cash and cash equivalents | 
                                                1,680,177,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                1,658,798,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                1,340,635,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,127,256,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |