 If you liked
Shitsuji-tachi no Chinmoku
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 ...then you might like
Senpai! Imakara Kokurimasu!
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Both have a very cute, energetic and a bit dumb main girl that chases the boy she likes
Both are shoujo-comedy manga, with very funny moments.
Both girls like to express their feelings all the time
The guys are older than the girl in both manga, and more rational than the girl.
Unique and beautiful artstyle
While Senpai! Imakara Kokurimasu is centered in the school theme with teenage love, Shitsuji-tachi no Chinmoku is about a noble daughter that falls in love with her butler.
Shitsuji-tachi no Chinmoku turns in the later chapters into a mature manga(after 27), while Senpai! Imakara Kokurimasu keeps the cute love story~