 If you liked
Onegai☆Teacher
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 ...then you might like
Nazo no Kanojo X
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These anime feature "weird" female MCs in romance + school settings, so weird you'd fall in love at first sight. Doubts and questions about love and faith in one's lover are even explored critically. Adequately similarly unusual plot devices are also present. One obvious difference is that NnK X is about the relationship between two students while OT is between a student and a teacher. Overall, the ratings both have have quite truth in them and that they're absolutely shows of the same weird caliber.