Balance Sheet
| Concept | As at 2024-06-30 | As at 2023-12-31 | 
|---|---|---|
| Balance sheet | ||
| Balance sheet | ||
| Assets | ||
| Current assets | 
                                                1,591,431,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,586,113,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Cash and deposits | 
                                                1,459,718,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,393,677,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Accounts receivable - trade | 
                                                38,848,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                34,596,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                89,775,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                154,398,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Merchandise | 
                                                3,088,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,441,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | ||
| Property, plant and equipment | ||
| Property, plant and equipment | 
                                                152,165,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                134,565,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other, net | 
                                                23,136,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                14,912,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | — | — | 
| Own-used assets | ||
| Intangible assets | ||
| Intangible assets | 
                                                15,057,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                17,034,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | ||
| Investments and other assets | 
                                                109,440,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                100,553,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Allowance for doubtful accounts | 
                                                -2,400,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -1,984,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                111,841,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                102,537,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | 
                                                276,663,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                252,153,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other assets | — | — | 
| Current assets | ||
| Other assets | ||
| Assets | 
                                                1,868,094,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,838,267,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | ||
| Non-current liabilities | ||
| Non-current liabilities | 
                                                45,904,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                48,552,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Long-term borrowings | 
                                                10,010,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                18,358,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                8,016,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                8,016,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Asset retirement obligations | 
                                                27,878,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                22,178,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current liabilities | 
                                                648,222,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                574,168,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Accounts payable - other | 
                                                89,599,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                77,009,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Accrued expenses | 
                                                124,108,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                100,122,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Income taxes payable | 
                                                29,541,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,393,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                65,118,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                96,873,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current liabilities | ||
| Contract liabilities | 
                                                339,853,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                295,769,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | 
                                                694,126,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                622,721,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other liabilities | — | — | 
| Other liabilities | — | — | 
| Liabilities and net assets | ||
| Shareholders' equity | 
                                                1,134,015,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,185,106,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Share capital | 
                                                73,300,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                71,500,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Capital surplus | 
                                                1,002,759,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,000,959,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Retained earnings | 
                                                58,014,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                112,681,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Treasury shares | 
                                                -59,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -35,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Share acquisition rights | 
                                                39,952,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                30,439,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | 
                                                1,173,968,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,215,545,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities and net assets | 
                                                1,868,094,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,838,267,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | ||
| Shareholders' equity | ||
| Capital surplus | ||
| Retained earnings |