Major Shareholders
| Concept | 
                                    
                                        As at 2025-03-31  | 
                            
                                
                                    
                                        As at 2025-03-31  | 
                            
                                
                                    
                                        As at 2025-03-31  | 
                            
                                
                                    
                                        As at 2025-03-31  | 
                            
                                
                                    
                                        As at 2025-03-31  | 
                            
                                
                                    
                                        As at 2025-03-31  | 
                            
                                
                                    
                                        As at 2025-03-31  | 
                            
                                
                                    
                                        As at 2025-03-31  | 
                            
                                
                                    
                                        As at 2025-03-31  | 
                            
                                
                                    
                                        As at 2025-03-31  | 
                            
                                
                                    
                                        As at 2025-03-31  | 
                            
                        
|---|---|---|---|---|---|---|---|---|---|---|---|
| Major shareholders | |||||||||||
| Major shareholders | |||||||||||
| Name | 
                                        
                                             
                                                江口 直宏
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                萩原 香菜
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                江口 惠津子
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                佐々木 洋
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                千田 美穂
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                林田 光司
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                株式会社ヴェルディッシモ
                                                
                                             
                                        
                                     | 
                                
                                    — | 
                                        
                                             
                                                江口 久
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                株式会社ジューテック
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                藤井 智子
                                                
                                             
                                        
                                     | 
                                
                            
| Address | 
                                        
                                             
                                                東京都杉並区
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                大阪市西区
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                東京都杉並区
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                東京都目黒区
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                東京都千代田区
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                東京都渋谷区
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                東京都千代田区西神田2-2-7
                                                
                                             
                                        
                                     | 
                                
                                    — | 
                                        
                                             
                                                東京都千代田区
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                東京都港区新橋6-3-4
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                大阪府和泉市
                                                
                                             
                                        
                                     | 
                                
                            
| Number of shares held | 
                                        
                                             
                                                190,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                190,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                190,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                107,400
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                190,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                101,600
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                616,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                3,342,600
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                1,482,600
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                160,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                115,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             
                                        
                                     | 
                                
                            
| Shareholding ratio (excluding treasury shares) | 
                                        
                                             
                                                0.0311
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                0.0311
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                0.0311
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                0.0176
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                0.0311
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                0.0166
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                0.1010
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                0.5479
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                0.2433
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                0.0262
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                0.0188
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             
                                        
                                     |