Phi-Brain ~ Puzzle of God
Kaito Daimon is a brilliant teenager who loves to solve puzzles. He acquires an enigmatic item called the Armband of Orpheus that allows him to fully utilize his brain, but that consequentially drains him completely. He's invited to confront a secret organization that creates deadly Sage Puzzles to protect invaluable treasures. Kaito must battle against the mysterious group in order to keep a promise he made as a kid while at the same time he heads towards the ultimate test: the Divine Puzzle.