In a near-future world where medical technology allows for heart transplants to be swapped among willing donors, players assume the role of a 'Heart Advocate' who must navigate an intricate tapestry of relationships, ethics, and dark secrets. Each heart has a story, and the protagonist must meet with various characters—each one holding a key to a hidden past and motivation behind their desire to either give away or claim a heart. As secrets are unveiled through dialogue and choices, the player must solve the mystery of who truly deserves their heart, leading to dramatic twists that challenge moral boundaries and personal loyalties.