 If you liked
Komi-san wa, Comyushou desu.
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 ...then you might like
Sono Bisque Doll wa Koi wo Suru
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"A girl who changes life of no-friend kind boy's life in good way." they have for concept. The romcom part is also similer but Dress-up Darling don't have a Najimi sadly. Also Dress-up Darling's characters are not much as Komi-san (Just 2 main. That's all.) But for read a similer Slice of Life romcom serie My Dress-up Darling is good enough.