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Revenue - Disaggregation of revenue (Details) - USD ($)
12 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Mar. 31, 2021
Revenue      
Revenue $ 11,323,744 $ 23,050,619 $ 29,168,546
Online VIP membership revenue      
Revenue      
Revenue 8,030,991 17,986,028 23,988,077
Online SVIP membership revenue      
Revenue      
Revenue 2,157,514 4,297,915 4,967,186
Technical service revenue      
Revenue      
Revenue $ 1,135,239 $ 766,676 $ 213,283