In a futuristic society where emotions are monetized and heart transplants are a common commodity, players assume the role of Kai, a savvy 'Heart Broker' who deals in the black market of hearts. After a heart he traded is mysteriously returned with haunting memories, Kai embarks on a thrilling investigation filled with twists and treachery to uncover the truth behind the heart's original owner. Along the way, players must navigate a web of shady deals, emotional conflicts, and moral dilemmas, deciding who to trust and which feelings to embrace or reject in an ever-darkening world where every heartbeat counts.