Balance Sheet
| Concept | As at 2023-12-31 | As at 2023-03-31 | 
|---|---|---|
| Balance sheet | ||
| Balance sheet | ||
| Assets | ||
| Current assets | ||
| Cash and deposits | 
                                                7,112,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,078,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Inventories | 
                                                16,644,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                16,071,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Allowance for doubtful accounts | 
                                                -7,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -7,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                868,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                849,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current assets | 
                                                38,397,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                36,968,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | ||
| Property, plant and equipment | 
                                                24,141,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                24,220,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Land | 
                                                3,145,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,145,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Construction in progress | 
                                                822,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                393,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other, net | 
                                                1,666,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,782,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | — | — | 
| Property, plant and equipment | ||
| Own-used assets | ||
| Intangible assets | ||
| Intangible assets | 
                                                1,190,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,233,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | 
                                                5,679,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,528,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Allowance for doubtful accounts | 
                                                -3,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -14,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | ||
| Non-current assets | 
                                                31,011,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                30,982,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other assets | — | — | 
| Other assets | ||
| Assets | 
                                                69,409,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                67,951,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities and net assets | ||
| Non-current liabilities | 
                                                24,781,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                24,603,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Bonds payable | 
                                                1,700,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,000,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Long-term borrowings | 
                                                15,807,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                15,295,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                894,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,042,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Asset retirement obligations | 
                                                69,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                68,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current liabilities | 
                                                25,819,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                25,582,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Short-term borrowings | 
                                                11,103,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                10,577,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Income taxes payable | 
                                                58,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                255,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                4,311,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,396,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | 
                                                50,600,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                50,186,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Shareholders' equity | 
                                                14,466,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                14,460,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Share capital | 
                                                1,755,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,755,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Capital surplus | 
                                                896,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                896,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Retained earnings | 
                                                11,978,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                11,971,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Treasury shares | 
                                                -163,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -163,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation and translation adjustments | 
                                                4,260,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,227,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation difference on available-for-sale securities | 
                                                2,133,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,870,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | 
                                                18,808,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                17,765,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities and net assets | 
                                                69,409,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                67,951,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | ||
| Current liabilities | ||
| Current portion of bonds payable | 
                                                300,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                800,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Contract liabilities | 
                                                7,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                8,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Provision for bonuses | 
                                                256,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                579,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Provisions | ||
| Non-current liabilities | ||
| Other liabilities | — | — | 
| Other liabilities | — | — | 
| Net assets | ||
| Shareholders' equity | ||
| Capital surplus | ||
| Retained earnings | ||
| Valuation and translation adjustments |