Semi-Annual Consolidated Balance Sheet
| Concept | As at 2024-03-31 | As at 2023-12-31 | 
|---|---|---|
| Semi-annual consolidated balance sheet | ||
| Balance sheet | ||
| Assets | ||
| Current assets | ||
| Cash and deposits | 
                                                2,419,753,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,502,405,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                143,022,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                145,639,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Allowance for doubtful accounts | 
                                                -508,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -509,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current assets | 
                                                3,479,711,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,509,069,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | ||
| Property, plant and equipment | 
                                                507,636,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                522,593,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Property, plant and equipment | ||
| Intangible assets | ||
| Intangible assets | 
                                                46,105,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                53,255,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | 
                                                1,793,960,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,517,552,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | ||
| Investment securities | 
                                                428,800,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                596,800,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Deferred tax assets | 
                                                26,319,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                25,020,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                194,191,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                753,368,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | 
                                                2,347,702,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,093,401,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Assets | 
                                                5,827,413,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,602,471,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | ||
| Current liabilities | ||
| Short-term borrowings | 
                                                500,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Income taxes payable | 
                                                20,423,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                119,464,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                457,268,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                407,177,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current liabilities | 
                                                1,118,516,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                670,059,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current liabilities | ||
| Retirement benefit liability | 
                                                40,424,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                42,622,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                60,815,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                64,016,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current liabilities | 
                                                210,626,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                254,483,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | 
                                                1,329,142,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                924,542,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Provision for bonuses | 
                                                59,447,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                20,603,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Deferred tax liabilities | 
                                                98,025,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                136,484,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | ||
| Shareholders' equity | ||
| Share capital | 
                                                87,232,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                87,232,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Capital surplus | 
                                                122,909,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                122,909,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Retained earnings | 
                                                3,838,827,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,981,038,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Treasury shares | 
                                                -190,768,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -190,768,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Shareholders' equity | 
                                                3,858,200,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,000,411,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation and translation adjustments | ||
| Valuation difference on available-for-sale securities | 
                                                210,277,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                320,397,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Foreign currency translation adjustment | 
                                                429,793,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                357,120,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation and translation adjustments | 
                                                640,070,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                677,517,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | 
                                                4,498,270,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,677,929,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities and net assets | 
                                                5,827,413,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,602,471,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |