 If you liked
Code Geass: Hangyaku no Lelouch
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 ...then you might like
Phi Brain: Kami no Puzzle
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In both the main character is a kind of "genius" with great ability to handle difficult situations: resolving unsolvable puzzles (Phi Brain) or build real-time strategy (Code Geass).
In both the main character deals with someone in closing a "contract" and gives him an "eye-power": C.C. gives to Lelouch the Geass in his left eye and when it's activated it turns red (Code Geass); Something like this happens to Kaito when he solves a puzzle and the prize was a kind of bracelet with the power of make Kaito's brain works to max of levels, and when it's activated his right eye turns red too.
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