In a futuristic city plagued by a rare disease that randomly swaps the hearts of its inhabitants, you play as a heart-swapper, an underground doctor who helps restore emotional balance in a chaotic society. Navigate through morally ambiguous decisions, interact with a colorful cast of characters whose hearts you may encounter, and solve the mystery of the 'Heart Thief,' a shadowy figure who disrupts the swaps for their own gain. Choices you make will affect not only your own heart but the lives of those around you as you grapple with love, betrayal, and the essence of what it means to truly 'feel.'