Statement Of Changes In Net Assets
| Concept | 
                                    
                                        2023-07-01 to 2023-12-31  | 
                            
                                
                                    
                                        As at 2023-12-31  | 
                            
                                
                                    
                                        As at 2023-06-30  | 
                            
                                
                                    
                                        2022-07-01 to 2022-12-31  | 
                            
                        
|---|---|---|---|---|
| Statement of changes in net assets | ||||
| Statement of changes in net assets | ||||
| Net assets | — | 
                                        
                                             
                                                4,566,201,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                4,705,258,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    — | 
| Changes during period | ||||
| Profit (loss) | 
                                        
                                             
                                                -29,007,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    — | — | 
                                        
                                             
                                                62,638,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             
                                        
                                     |