In a world where emotions are tangible and can be transferred between individuals, you play as a Heart Trader navigating a bustling underground market. Each player starts with a unique emotion represented by a heart of a different color, which grants them specific abilities and personalities. Your goal is to gather a reputation as the best Heart Trader, but to do so, you must arrange emotional trades, form alliances, and face off against emotional crises that threaten the market's delicate balance. As you interact with quirky characters and make moral choices, your own emotional state shifts based on the hearts you collect or trade. Will you become a benevolent trader, or will you exploit others’ emotions for personal gain? The fate of your heart lies in the choices you make.