 If you liked
Kami nomi zo Shiru Sekai
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 ...then you might like
Genkaku Picasso
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Both series have a similar premise: the protagonist is a loner with obscure interests who is called a weird nickname by the rest of the class; "Picasso" in Genkaku and "Otamegane" in KamiNomi. They encounter a supernatural girl and are then told to help people who are suffering from terrible burdens in their heart. If they don't, they will die. They end up using their "weird" interests in order to save people's hearts and become better people themselves.