In a dystopian future, humanity has learned to transplant emotions into hearts, creating a black market of feelings. You play as a 'Heart Detective,' tasked with tracing stolen hearts to uncover the truth behind a mysterious crime wave in your city. Interact with quirky characters, piece together clues, and make moral choices that will alter your own emotional state. Will you restore love and happiness or exploit those feelings for your gain? The outcomes vary with each decision, leading to multiple endings filled with unexpected twists.