The story follows a young woman named , who arrives at Galleria Manor to assist an elderly witch, Madame Marta , in retrieving mysterious artifacts known as "Curios d'art" from an underground labyrinth.

: You play as a wandering spirit housed in a magical lantern ( Lanterne de Fantasmagorie ), commanding a "Witch Brigade" of soul-infused puppet soldiers because the labyrinth is lethal to living humans.

: Much of the story is told via visual novel-style cutscenes that trigger upon leaving the dungeon after reaching specific milestones. The plot is highly ambitious, often taking over 100 hours to reach the "True Ending". Core Gameplay Mechanics

The game is renowned for its sheer scale and the complexity of its customization.