Semi-Annual Consolidated Balance Sheet
| Concept | As at 2024-06-30 | As at 2023-12-31 | 
|---|---|---|
| Semi-annual consolidated balance sheet | ||
| Balance sheet | ||
| Assets | ||
| Current assets | ||
| Cash and deposits | 
                                                1,123,791,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,191,379,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Inventories | 
                                                6,529,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,951,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                102,361,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                113,784,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Allowance for doubtful accounts | 
                                                -932,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -1,296,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current assets | 
                                                1,363,069,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,396,609,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | ||
| Property, plant and equipment | 
                                                46,294,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                43,885,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Property, plant and equipment | ||
| Buildings and structures | 
                                                51,264,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                47,898,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Accumulated depreciation | 
                                                -20,314,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -17,605,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Buildings and structures, net | 
                                                30,950,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                30,292,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Machinery, equipment and vehicles | 
                                                6,768,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,595,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Accumulated depreciation | 
                                                -6,542,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -6,314,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Machinery, equipment and vehicles, net | 
                                                225,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                281,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Intangible assets | ||
| Other | 
                                                1,368,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,445,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Intangible assets | 
                                                210,295,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                190,857,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | 
                                                191,744,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                186,111,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | ||
| Investment securities | 
                                                28,440,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                28,495,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Long-term loans receivable | 
                                                9,090,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                9,090,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Deferred tax assets | 
                                                67,474,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                64,615,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                131,801,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                127,481,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Allowance for doubtful accounts | 
                                                -45,062,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -43,571,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | 
                                                448,335,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                420,854,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Assets | 
                                                1,811,405,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,817,464,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | ||
| Current liabilities | ||
| Lease liabilities | 
                                                1,056,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Income taxes payable | 
                                                36,204,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                28,427,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                133,331,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                140,527,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current liabilities | 
                                                501,970,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                535,186,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current liabilities | ||
| Long-term borrowings | 
                                                5,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                14,185,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Lease liabilities | 
                                                4,109,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Retirement benefit liability | 
                                                159,648,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                157,712,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                2,174,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,134,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current liabilities | 
                                                170,932,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                173,031,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | 
                                                672,902,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                708,218,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Provision for bonuses | 
                                                32,653,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                26,557,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | ||
| Share capital | 
                                                266,796,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                266,796,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Shareholders' equity | ||
| Capital surplus | 
                                                216,796,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                216,796,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Retained earnings | 
                                                639,441,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                619,779,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Shareholders' equity | 
                                                1,123,033,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,103,372,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation and translation adjustments | ||
| Valuation difference on available-for-sale securities | 
                                                313,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                350,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Foreign currency translation adjustment | 
                                                15,155,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,523,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation and translation adjustments | 
                                                15,468,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,873,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | 
                                                1,138,502,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,109,245,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities and net assets | 
                                                1,811,405,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,817,464,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |