 If you liked
Yamada-kun to 7-nin no Majo
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 ...then you might like
Kishuku Gakkou no Juliet
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Both are Romcom that make me laugh and make my hearth racing.
They have a strong protagonist with a girlfriend and a "harem".
Yamada is a school life but with a bit of magic but it's modern, it's not a common romcom ( indeed that's my favorite). And in yamada, there is no secret relationship with a war beetwen people like in Juliet.
Have fun watching it !