 If you liked
Spiral: Suiri no Kizuna
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 ...then you might like
Monochrome Factor
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They are both really similar in that the main character is intelligent and cool!!!XD & they both dont care about anything, nor do they have many friends in the beginning.
The ending is quite similar too! it ends up that both animes doesnt explain at all everything and makes you think there will be a second season.