Archibald, a shy and observant boy, has a dream: to become a great detective. And not just any sort of detective! He wants to explore secret worlds, those where magic reigns and monsters lurk in the shadows. All he needs is his first big case!
After years of failure to discover the meaning of the universe, Professor Ichinoseki decides to end his own life, but he is interrupted by the sorceress Mephisto. They strike a bargain: in exchange for Ichinoseki's soul, Mephisto will grant his wish for a fulfilled life...