In a dystopian future where emotions can be traded like commodities, players assume the role of Alter, a heart and empathy dealer, who has become a target for a shadowy organization seeking to monopolize human emotions. Players navigate a series of morally complex decisions, offering tailored heart exchanges while uncovering the stories tied to each unique emotional fragment. Along the way, they meet diverse characters with deeply personal stories, compelling the player to understand the true value of human connection. As they make choices that can heal or harm, will Alter reveal their own buried emotions, or will they be forever adrift in a sea of transactional hearts?