In a world where people can swap hearts to experience life from others' perspectives, you play as a young empath named Kai, who discovers that someone's heart has gone missing—and it's linked to a notorious criminal organization. Players embark on a thrilling journey through various lives, solving puzzles and gathering clues from different heart hosts, ultimately leading to twisted revelations about identity, morality, and the lengths one would go to protect their own heart. Unraveling the mystery requires tapping into the emotions of those connected to the heart, creating emotional connections that could affect the game's outcome.