Set in a world where people's hearts are literally separated from their bodies, players assume the role of a heartless protagonist who must traverse the eerie city of Cardia. Each heart is uniquely tied to a specific memory or emotion, and players must interact with various characters to uncover the stories and consequences of their choices. As they collect hearts, the protagonist gains access to different powers and insights, but at a cost. Each decision leads to psychological twists that shape the narrative, entwining themes of empathy, regret, and identity as they unravel the mystery of their own heart's disappearance.