Semi-Annual Consolidated Balance Sheet
| Concept | As at 2023-12-31 | As at 2023-03-31 | 
|---|---|---|
| Semi-annual consolidated balance sheet | ||
| Balance sheet | ||
| Assets | ||
| Current assets | ||
| Cash and deposits | 
                                                629,153,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                614,164,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                15,719,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                10,100,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current assets | 
                                                1,155,161,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,165,293,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | ||
| Property, plant and equipment | 
                                                118,674,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                119,277,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Property, plant and equipment | ||
| Land | 
                                                118,674,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                119,277,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | 
                                                160,406,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                149,766,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | ||
| Investment securities | 
                                                95,058,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                95,225,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                65,347,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                54,540,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | 
                                                279,080,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                269,044,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Assets | 
                                                1,434,241,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,434,337,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | ||
| Current liabilities | ||
| Notes and accounts payable - trade | 
                                                5,233,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,697,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Short-term borrowings | 
                                                135,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                130,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                71,376,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                85,252,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current liabilities | 
                                                235,933,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                252,005,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current liabilities | ||
| Long-term borrowings | 
                                                90,843,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                99,101,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Retirement benefit liability | 
                                                8,260,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,614,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current liabilities | 
                                                99,103,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                103,715,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | 
                                                335,036,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                355,720,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Provision for bonuses | 
                                                13,182,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                25,166,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | ||
| Shareholders' equity | ||
| Share capital | 
                                                50,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,029,041,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Capital surplus | 
                                                1,040,407,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,061,421,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Retained earnings | 
                                                10,788,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -4,009,856,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Treasury shares | 
                                                -1,990,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -1,990,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Shareholders' equity | 
                                                1,099,205,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,078,616,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | 
                                                1,099,205,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,078,616,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities and net assets | 
                                                1,434,241,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,434,337,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |