Statement Of Cash Flows
| Concept | 2024-01-01 to 2024-06-30 | As at 2024-06-30 | As at 2023-12-31 | 2023-01-01 to 2023-06-30 | As at 2023-06-30 | As at 2022-12-31 | 
|---|---|---|---|---|---|---|
| Statement of cash flows | ||||||
| Statement of cash flows | ||||||
| Cash flows from operating activities | ||||||
| Profit (loss) before income taxes | 
                                                113,701,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                695,101,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Depreciation | 
                                                31,734,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                32,925,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Increase (decrease) in allowance for doubtful accounts | 
                                                -1,088,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -4,986,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Interest expenses | 
                                                8,149,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                3,708,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Increase (decrease) in provision for bonuses | 
                                                -865,656,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -269,738,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Decrease (increase) in trade receivables | 
                                                222,108,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                51,643,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Subtotal | 
                                                -2,110,178,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                630,399,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Increase (decrease) in trade payables | 
                                                -625,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                25,072,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Income taxes paid | 
                                                -360,422,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -254,886,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Other, net | 
                                                -172,659,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -72,881,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net cash provided by (used in) operating activities | 
                                                -2,478,872,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                371,742,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Interest paid | 
                                                -8,339,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -3,829,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Cash flows from operating activities | ||||||
| Increase (decrease) in accounts payable - other | 
                                                80,354,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                65,771,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Cash flows from operating activities | ||||||
| Cash flows from investing activities | ||||||
| Purchase of property, plant and equipment | 
                                                -716,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -30,328,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net cash provided by (used in) investing activities | 
                                                -20,079,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -68,815,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Cash flows from facilities maintenance and investing activities | ||||||
| Cash flows from financing activities | ||||||
| Dividends paid | 
                                                -479,340,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -320,371,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Repayments of long-term borrowings | 
                                                -118,714,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -69,793,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net cash provided by (used in) financing activities | 
                                                -3,171,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                3,100,207,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Effect of exchange rate change on cash and cash equivalents | 
                                                6,552,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                3,589,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net increase (decrease) in cash and cash equivalents | 
                                                -2,495,570,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                3,406,724,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Cash and cash equivalents | — | 
                                                3,343,175,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,838,745,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                6,605,814,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,199,089,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |