Summary [AniDB]:[Daimon Kaito] would be a completely average high school student except for one thing: he`s a demon at solving puzzles. Kaito`s so brilliant, in fact, that when he`s asked to take some special tests of his unique ability, he immediately suspects that the test itself is a test. Kaito suddenly finds himself caught up in a lethal Philosopher`s Puzzle made by the sinister group POG, a murderous maze of trap upon trap, where failing to solve the secret correctly will result in death! Fortunately, Kaito`s skills prove up to the first test, both for himself AND his childhood friend [Nanoha], who is also caught up in the deadly scheme. But now that he has been designated as a Solver, he is pulled into a new life where he must travel the world with other Solvers, attempting to solve the latest deadly riddles left by POG. There`s a new conundrum around every corner and each deception could lead to death, but once a riddle has been posed, you can count on Kaito to unfold, unravel and unlock it in Phi-Brain ~ Kami no Puzzle!
Source: Sentai Filmworks