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 | 
                                                1,296,943,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,530,969,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                82,307,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                120,184,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current assets | 
                                                1,379,275,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,651,210,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | ||
| Property, plant and equipment | 
                                                0
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                0
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Property, plant and equipment | ||
| Intangible assets | ||
| Intangible assets | 
                                                0
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                0
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | 
                                                49,296,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                50,234,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | ||
| Non-current assets | 
                                                49,296,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                50,234,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Assets | 
                                                1,428,572,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,701,444,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | ||
| Current liabilities | ||
| Income taxes payable | 
                                                5,976,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                10,409,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                91,907,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                66,072,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current liabilities | 
                                                597,902,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                76,558,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current liabilities | ||
| Asset retirement obligations | 
                                                22,625,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                22,556,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                0
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                0
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current liabilities | 
                                                57,916,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                57,345,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | 
                                                655,819,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                133,903,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | ||
| Shareholders' equity | ||
| Share capital | 
                                                439,412,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                362,185,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Capital surplus | 
                                                2,747,947,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,670,720,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Retained earnings | 
                                                -2,439,399,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -1,485,633,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Treasury shares | 
                                                0
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                0
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Shareholders' equity | 
                                                747,960,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,547,272,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Share acquisition rights | 
                                                24,792,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                20,268,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | 
                                                772,753,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,567,541,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities and net assets | 
                                                1,428,572,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,701,444,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |