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Summary of significant accounting policies (Tables)
6 Months Ended
Sep. 30, 2022
Accounting Policies [Abstract]  
Schedule of exchange rates
               
    September 30, 2022       September 30, 2021   
Period-end spot rate     EUR 1 = US$0.9783     EUR 1 = US$1.1577    
Average rate     EUR 1 = US$1.0353     EUR 1 = US$1.1917    
Schedule of estimated annual deprecation rate
           
Category   Depreciation rate   Estimated residual value  
Office equipment   3 years      Nil
Leasehold improvements   Shorter of lease term or 3 years      Nil