In a world where people's emotions are tied to physical hearts that can be borrowed or stolen, you play as an Emotion Engineer—someone who can navigate the complex web of emotional exchanges. A renowned heart thief has stolen a crucial heart that has the power to alter public feelings in society. As you delve into the underbelly of this strange world, you'll need to interview suspects, uncover emotional motives, and piece together the truth. Your choices dictate the outcome, impacting the city's emotional landscape and your character's own feelings in the process.