 If you liked
Rosario to Vampire
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 ...then you might like
Love♥Monster
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there similar in a way with the monster high school n the human getting sent there after failing there high school exams...the only diffrences is in love monster its a girl n in this manga its a boy....but there both really good n ecchi...also the adventure n constent battles wit other monsters...if u luv this manga i believe u would deffitnly like love monster....