A boy who wandered into another world awakens in an unfamiliar, dark corridor, where he is almost killed by both monsters and humans.

To return to his original world, he resolves to reach the 'deepest part' of the labyrinth.

Utilizing all that the world grants him, and accompanied by his talented companions, the boy presses on towards the 'deepest part'.

—And when he overcomes the 'trials' of the 'Reason Thieves' awaiting him in the labyrinth, 'you' will uncover the truth of a world devoid of reason.

※This is the main page. By reading through this, you can follow the main story.