In a bustling steampunk city, you play as a heartthief—a con artist who creatively crafts identities using stolen hearts. When a heartsong, a rare artifact that can overhear the emotions stored in hearts, falls into your hands, the stakes rise. You must navigate a web of rival heartthieves, a powerful aristocracy, and an underground resistance while deciding whose heart to keep, who to betray, and ultimately, who you truly are. Your choices shape not only the lives of others but also your own instinctual place in society, as you come to grips with the ethics of using hearts for personal gain.