Six exorcists are gathered in a mysterious mansion.

They are told they will be released from the mansion on the condition that they conquer the underground labyrinth, but the mansion is filled with an evil presence.

Their attempts to conquer the labyrinth are thwarted.

It is clear that there is a fallen “traitor” among the exorcists…

The traitor changes as the days repeat.

Through discussion, eliminate the exorcists who have fallen into darkness, and aim for the abyss of the underground labyrinth…!