 If you liked
Haru x Kiyo
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 ...then you might like
Takasugi-san no Chibiyan Hero
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They both have characters where the girl is really tall and the guy is shorter than her. However, instead of a delinquent, the guy is really smart but is also shy in showing his feelings. The girl is virtually the same where she likes the guy but is very insecure about it. Both have a similar vibe with a different art style.