Statement Of Cash Flows
| Concept | 2024-04-01 to 2025-03-31 | As at 2025-03-31 | 2024-04-01 to 2025-03-31 | 2023-04-01 to 2024-03-31 | As at 2024-03-31 | 2023-04-01 to 2024-03-31 | As at 2023-03-31 | 
|---|---|---|---|---|---|---|---|
| Statement of cash flows | |||||||
| Statement of cash flows | |||||||
| Cash flows from operating activities | |||||||
| Profit (loss) before income taxes | 
                                                272,775,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                444,947,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -350,161,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -342,048,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Depreciation | — | — | 
                                                36,204,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                7,334,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Impairment losses | — | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                24,716,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Interest and dividend income | — | — | 
                                                -5,437,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -10,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Interest expenses | — | — | 
                                                5,259,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                7,166,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Foreign exchange losses (gains) | — | — | 
                                                0
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                0
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Increase (decrease) in provision for bonuses | — | — | 
                                                -99,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -1,348,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Loss (gain) on sale of property, plant and equipment | — | — | 
                                                -491,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -2,386,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Decrease (increase) in trade receivables | — | — | 
                                                -276,457,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                51,748,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Decrease (increase) in inventories | — | — | 
                                                -33,297,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                15,995,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Subtotal | — | — | 
                                                47,805,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -28,188,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Increase (decrease) in trade payables | — | — | 
                                                250,387,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -1,177,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Other, net | — | — | 
                                                17,354,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Income taxes paid | — | — | 
                                                -23,725,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -1,447,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Net cash provided by (used in) operating activities | — | — | 
                                                24,283,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -36,599,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Interest and dividends received | — | — | 
                                                5,437,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                10,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Interest paid | — | — | 
                                                -5,234,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -6,972,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Decrease (increase) in other assets | — | — | 
                                                -62,946,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                52,530,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Increase (decrease) in other liabilities | — | — | 
                                                -42,709,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -9,010,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Cash flows from operating activities | |||||||
| Cash flows from operating activities | |||||||
| Increase (decrease) in accounts payable - other | — | — | 
                                                37,832,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                18,206,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Cash flows from investing activities | |||||||
| Purchase of property, plant and equipment | — | — | 
                                                -19,767,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -507,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Proceeds from sale of property, plant and equipment | — | — | 
                                                1,411,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,386,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Net cash provided by (used in) investing activities | — | — | 
                                                35,654,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -50,724,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Other, net | — | — | 
                                                5,626,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -8,780,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Cash flows from facilities maintenance and investing activities | |||||||
| Cash flows from financing activities | |||||||
| Proceeds from issuance of shares | — | — | 
                                                187,071,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Proceeds from long-term borrowings | — | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                87,557,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Net cash provided by (used in) financing activities | — | — | 
                                                789,235,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                90,084,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Repayments of long-term borrowings | — | — | 
                                                -24,926,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -144,482,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Other, net | — | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                0
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Net increase (decrease) in cash and cash equivalents | — | — | 
                                                849,619,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,101,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Effect of exchange rate change on cash and cash equivalents | — | — | 
                                                446,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                340,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Cash and cash equivalents | — | 
                                                1,076,218,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                214,124,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                211,023,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |