In a world where shadows have personalities and can detach from their owners, you play as Zephyr, a quirky detective with a peculiar ability: you can communicate with and manipulate shadows. When a notorious shadow thief begins stealing sentient shadows, leaving their owners confused and scared, it's up to you to solve the mystery. Navigate through bustling shadow markets, untrustworthy characters, and shadowy realms, while piecing together clues about the thief's identity. Each decision you make influences both the light and shadow realms, leading to multiple endings based on your choices and relationships with other characters, including their unique shadow companions.