In a world where emotions are manifested as tangible objects, players navigate a chaotic metropolis as a 'Heart Merchant' who can trade, steal, or unite hearts to forge emotional bonds or wreak havoc. As the protagonists interact with various characters, they must navigate the complexities of love, rivalry, and betrayal while drawing on the peculiar powers of the hearts they possess. Choices made in conversations and decisions regarding heart trades lead to a branching narrative, with multiple endings based on emotional connections or manipulations, all while uncovering the mystery of the lost heart that could change everything as they know it.