 If you liked
Seikimatsu Occult Gakuin
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 ...then you might like
Ao no Exorcist
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The similarities are glaring: they're both about strong-willed students pursing a goal that could save the world, while attending an occult-based school. Blue Exorcist however is a bit darker, with more graphic artwork and a bit more fluid. Both are fun, supernatural action adventures that really makes you curious as to what will befall your hero.