 If you liked
Hachi-nan tte, Sore wa Nai deshou!
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 ...then you might like
Seiken Gakuin no Makentsukai
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S:
Both MC reincarnate as kids
Both series take place in fantasy world
Both MC have female group (harem)
Both MC hide their overpowered skills
D:
Hachi reincarnates from human vs Seiken reincarnates as monster
Hachi MC is from modern day vs Seiken MC is from alternate fantasy world