In a world where shadows are sentient, players take on the role of a quirky detective named Aveline who specializes in resolving shadow disputes. Each level presents a new case involving stolen shadows, mistaken identities, and shadowy conspiracies. Players investigate various locations, solve puzzles, and interview the shadow inhabitants—who often have wildly different personalities than their counterparts. As they delve deeper, they uncover a dark plot threatening the very existence of both light and shadow. Choices matter, leading to multiple endings based on how players navigate this whimsical yet dramatic realm.