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 | 
                                                409,648,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                326,428,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Interest paid | 
                                                -31,380,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -3,269,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net cash provided by (used in) operating activities | 
                                                270,515,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                177,541,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Cash flows from investing activities | |||||
| Purchase of property, plant and equipment | 
                                                -27,186,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -30,845,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Proceeds from sale of property, plant and equipment | 
                                                1,851,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Purchase of investment securities | 
                                                -10,026,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Purchase of shares of subsidiaries resulting in change in scope of consolidation | 
                                                -2,022,874,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net cash provided by (used in) investing activities | 
                                                -2,146,958,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -90,615,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Cash flows from financing activities | |||||
| Repayments of long-term borrowings | 
                                                -300,932,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -84,783,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Proceeds from issuance of shares | 
                                                11,300,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                18,800,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Purchase of treasury shares | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -36,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net cash provided by (used in) financing activities | 
                                                2,079,266,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                167,277,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Effect of exchange rate change on cash and cash equivalents | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net increase (decrease) in cash and cash equivalents | 
                                                202,823,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                254,203,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Cash and cash equivalents | — | 
                                                1,116,537,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                913,714,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                659,511,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |