In a world where emotions and memories are tangible commodities, players take on the role of a heart merchant navigating a bustling underground market. Each heart holds the memories and emotions of its previous owner, and players must interact with quirky clients, uncover hidden truths, and piece together a mystery surrounding the disappearance of a renowned heart artist whose creations could change the emotional landscape forever. As players trade, negotiate, and sometimes steal hearts, choices lead to dramatic consequences affecting the merchant's own emotions and memories. The game features rich dialogue with unexpected twists and character development based on the player's moral decisions.