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 | 
                                                1,769,408,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,267,086,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                63,786,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                109,914,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Allowance for doubtful accounts | 
                                                -243,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -289,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current assets | 
                                                2,313,348,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,033,750,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | ||
| Property, plant and equipment | 
                                                7,228,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,882,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Property, plant and equipment | ||
| Intangible assets | ||
| Intangible assets | 
                                                12,680,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                11,136,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | 
                                                175,222,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                157,805,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | ||
| Investment securities | 
                                                21,123,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                999,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                8,839,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                8,978,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Allowance for doubtful accounts | 
                                                -8,839,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -8,839,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | 
                                                195,131,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                175,824,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Deferred assets | 
                                                2,908,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Deferred assets | ||
| Bond issuance costs | 
                                                2,908,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Assets | 
                                                2,511,387,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,209,575,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | ||
| Current liabilities | ||
| Short-term borrowings | 
                                                800,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                900,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Income taxes payable | 
                                                6,860,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,616,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                84,727,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                125,876,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current liabilities | 
                                                1,374,052,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,338,097,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current liabilities | ||
| Bonds payable | 
                                                136,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Long-term borrowings | 
                                                95,150,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                160,457,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Retirement benefit liability | 
                                                80,780,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                77,233,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current liabilities | 
                                                445,630,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                373,590,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | 
                                                1,819,682,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,711,687,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | ||
| Shareholders' equity | ||
| Share capital | 
                                                193,877,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                80,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Capital surplus | 
                                                795,013,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                695,696,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Retained earnings | 
                                                -291,799,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -272,157,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Treasury shares | 
                                                -6,427,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -6,427,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Shareholders' equity | 
                                                690,664,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                497,111,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation and translation adjustments | ||
| Valuation difference on available-for-sale securities | 
                                                900,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                777,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation and translation adjustments | 
                                                900,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                777,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Share acquisition rights | 
                                                140,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | 
                                                691,705,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                497,888,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities and net assets | 
                                                2,511,387,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,209,575,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |