Quarterly Balance Sheet
| Concept | As at 2024-06-30 | As at 2023-12-31 | 
|---|---|---|
| Quarterly balance sheet | ||
| Balance sheet | ||
| Assets | ||
| Current assets | ||
| Cash and deposits | 
                                                3,385,402,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,873,773,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Merchandise and finished goods | 
                                                37,370,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                34,856,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                2,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                431,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current assets | 
                                                3,528,559,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,987,440,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | ||
| Property, plant and equipment | 
                                                158,868,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                169,970,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Property, plant and equipment | ||
| Machinery and equipment | — | — | 
| Machinery and equipment, net | 
                                                267,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                356,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Tools, furniture and fixtures | — | — | 
| Tools, furniture and fixtures, net | 
                                                37,844,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                43,782,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Intangible assets | 
                                                4,741,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,374,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Intangible assets | ||
| Patent right | 
                                                2,330,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,640,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Software | 
                                                1,911,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,233,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                500,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                500,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | 
                                                152,582,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                53,024,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | ||
| Investments in capital | 
                                                10,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                10,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Long-term prepaid expenses | 
                                                100,688,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | 
                                                316,191,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                227,368,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Assets | 
                                                3,844,751,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,214,809,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | ||
| Current liabilities | ||
| Short-term borrowings | 
                                                450,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                550,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Income taxes payable | 
                                                15,284,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                16,503,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current liabilities | 
                                                577,717,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                666,339,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current liabilities | ||
| Long-term borrowings | 
                                                336,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                345,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current liabilities | 
                                                336,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                345,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | 
                                                913,717,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,011,339,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | ||
| Shareholders' equity | ||
| Share capital | 
                                                1,358,240,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,283,445,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Capital surplus | 
                                                3,980,167,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,905,372,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Retained earnings | 
                                                -2,433,264,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -1,986,050,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Shareholders' equity | 
                                                2,905,143,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,202,767,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Share acquisition rights | 
                                                25,889,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                702,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | 
                                                2,931,033,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,203,469,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities and net assets | 
                                                3,844,751,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,214,809,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |