Semi-Annual Consolidated Statement Of Cash Flows
| Concept | 2024-01-01 to 2024-12-31 | As at 2024-12-31 | 2023-01-01 to 2023-12-31 | As at 2023-12-31 | As at 2022-12-31 | 
|---|---|---|---|---|---|
| Semi-annual consolidated statement of cash flows | |||||
| Statement of cash flows | |||||
| Cash flows from operating activities | |||||
| Subtotal | 
                                                145,015,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                273,675,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Interest and dividends received | 
                                                1,270,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                2,277,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Income taxes paid | 
                                                -13,652,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -212,931,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net cash provided by (used in) operating activities | 
                                                132,633,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                63,021,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Cash flows from investing activities | |||||
| Purchase of property, plant and equipment | 
                                                -30,873,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -2,906,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Proceeds from sale of property, plant and equipment | 
                                                79,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                38,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Proceeds from sale of investment securities | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                127,646,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Other, net | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                474,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net cash provided by (used in) investing activities | 
                                                -206,885,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -61,779,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Cash flows from financing activities | |||||
| Proceeds from issuance of shares | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                185,361,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Purchase of treasury shares | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -39,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Dividends paid | 
                                                -46,456,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -43,743,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net cash provided by (used in) financing activities | 
                                                -46,456,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                122,983,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Effect of exchange rate change on cash and cash equivalents | 
                                                75,443,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                18,162,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net increase (decrease) in cash and cash equivalents | 
                                                -45,264,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                142,387,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Cash and cash equivalents | — | 
                                                3,358,057,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                3,403,321,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,260,933,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |