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 | 
                                                3,026,030,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,889,101,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                272,016,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                374,044,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current assets | 
                                                3,544,519,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,191,484,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | ||
| Property, plant and equipment | 
                                                99,070,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                105,498,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Property, plant and equipment | ||
| Intangible assets | ||
| Intangible assets | 
                                                679,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,091,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | 
                                                41,380,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                51,817,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | ||
| Non-current assets | 
                                                141,130,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                158,407,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Assets | 
                                                3,685,650,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,349,891,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | ||
| Current liabilities | ||
| Income taxes payable | 
                                                23,644,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                28,273,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                19,334,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                36,349,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current liabilities | 
                                                370,644,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                375,921,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current liabilities | ||
| Long-term borrowings | 
                                                18,406,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                28,402,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Asset retirement obligations | 
                                                38,972,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                38,657,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                42,310,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                29,375,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current liabilities | 
                                                99,689,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                96,435,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | 
                                                470,333,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                472,356,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | ||
| Share capital | 
                                                2,258,599,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,076,474,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Shareholders' equity | ||
| Capital surplus | 
                                                6,009,808,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,827,683,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Retained earnings | 
                                                -5,169,504,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -4,075,386,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Treasury shares | 
                                                -222,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -222,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Shareholders' equity | 
                                                3,098,680,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,828,549,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation and translation adjustments | ||
| Valuation difference on available-for-sale securities | 
                                                -3,148,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -2,722,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Deferred gains or losses on hedges | 
                                                27,374,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Foreign currency translation adjustment | 
                                                92,408,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                51,709,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation and translation adjustments | 
                                                116,635,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                48,986,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | 
                                                3,215,316,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,877,535,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities and net assets | 
                                                3,685,650,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,349,891,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |