 If you liked
Kaguya-sama wa Kokurasetai: Tensai-tachi no Renai Zunousen
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 ...then you might like
Machikado Mazoku
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First of all... kaguya-sama is a rom-com manga and Machikado mazoku is some kind of fantasy-comedy manga. However, both mangas know how to transform a very serious and important moment(mostly trying to convey some motivational message) in a funny one just with the appereance of one random character. Also the development of their personalities is something that I feel very similar since the main characters of these mangas are not the same at the beginning in comparison with their latest chapters. You can feel a little but pleasant change in their personalities.