 If you liked
Yandere Kanojo
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 ...then you might like
Hana-kun to Koisuru Watashi
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Romance comedy slice of life with a female delinquent in Yandere Kanojo is and male in Hana-kun is male.
School settings and both could be labeled "Fast Romance" with Yandere focusing slightly more on the comedy and its seinen and Hana-Kun mostly on the romance and its shoujo.