 If you liked
Karakai Jouzu no Takagi-san
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 ...then you might like
Komi-san wa, Comyushou desu.
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Both are a very cute slow progressing (But indeed have development, just "slow") fun romance. Reading both of these I gets the feeling of "Why are both of them not married yet??". If you like cute, wholesome, happy, and all the adorableness I recommend to check this out!