The "Imaginary Labyrinth" is a seven-layered space created by an unknown civilization. Each layer presents a trial of one of the "Seven Deadly Sins" (pride, greed, gluttony, and so on). Clearing it takes seven days, while failure means the entire group is annihilated. The dead are reborn, but trigger "memory entropy," randomly losing some of their memories with each resurrection. Those who awaken a "Spirit Pact" can form contracts with the labyrinth's "Imaginary Creatures" and gain supernatural abilities, but must pay a price, such as their lifespan or emotions.
