 If you liked
Masou Gakuen HxH
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 ...then you might like
Scared Rider Xechs
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Both have the same setting base on some apocalyptic future where humankind in at odds with some inter-dimensional beings and one of the characters also happen to be one of those beings fighting for the humans. Also there is that one character that serves a special purpose for the team fighting against those inter-dimensional beings, except of course in HxH the at one character have to do something errrrrrr, let's just say something kinky to his team/ harem while the special character in Scared Rider serve as the team/reverse harem leader/mentor.