Kaito Daimon is just like any other regular high school student, except for his exceptional talent for solving puzzles. His gift is so outstanding that when requested to take exclusive tests to showcase his rare ability, he is immediately wary of the scenario. Little did he know, he was about to embark on a deadly journey through POG's treacherous Philosopher's Puzzle, a complex maze of snares upon snares where a wrong solution could result in severe consequences. Thankfully, Kaito manages to prove himself during his first challenge, saving not only his own life but also that of his childhood friend Nanoha who is also caught in the game. Now, as a designated Solver, he must face an entirely new existence that involves traveling the world with other Solvers, tackling POG's newest fatal riddles. Danger lurks at every turn, and each devious scheme could lead to death, but Kaito's uncanny ability to decode, demystify and decipher ensures he is always one step ahead!