 If you liked
Aku no Hana
|
 ...then you might like
Jinx
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Incredibly toxic and straight up abusive "couple" where for a large part it's not clear if the other party actually even likes the main character or if they're just having fun toying around with him, and he seems to just go along with it due to being a pervert and having no self esteem
Nakamura and JJK are also kind of similar in that you have no fucking clue why they do the things they do