 If you liked
Youkai Gakkou no Sensei Hajimemashita!
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 ...then you might like
Jibaku Shounen Hanako-kun
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The main characters Abe and Hanako both are identical twins.The story is located in a school setting,had deal with time travel one point in the story,runs in the same magazine (Monthly G Fantasy) ,interspecies romance,deals with supernatural issues and they had a crossover together!