Phi-Brain ~ Puzzle of God

Kaito Daimon is a high school student with a remarkable talent for solving puzzles, which often earns him the nickname 'demon.' His exceptional abilities led to him being recruited for a series of 'special' tests designed to assess his unique skills. Kaito soon discovered that one of these tests was actually a lethal game devised by the group POG, which posed a deadly maze of traps and puzzles to be solved correctly to avoid fatal consequences. With his skills and those of his childhood friend Nanoha, Kaito must now travel the world as a Solver, attempting to decipher the complex riddles left by POG.