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Warrant liabilities (Details 2) - ¥ / shares
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Sep. 16, 2022
Sep. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]        
Outstanding warrants Exercised 2,182,470      
Outstanding warrants, ending   6,020,500    
Private Warrants [Member]        
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]        
Outstanding warrants, beginning   270,500   270,500
Weighted Average Exercise Price Per Share , beginning   ¥ 11.50   ¥ 11.50
Average remaining Period (Years)   5 years 5 years 5 years
Outstanding warrants Issued    
Weighted Average Exercise Price Per Share Issued    
Outstanding warrants Forfeited    
Weighted Average Exercise Price Per Share Forfeited    
Outstanding warrants Exercised    
Weighted Average Exercise Price Per Share Exercised    
Outstanding warrants Expired    
Weighted Average Exercise Price Per Share Expired    
Outstanding warrants, ending   270,500 270,500 270,500
Weighted Average Exercise Price Per Share , ending   ¥ 11.50 ¥ 11.50 ¥ 11.50