In a world where emotions are literally harvested and traded, players assume the role of a rogue 'Emotional Engineer' who specializes in manipulating human hearts. The game unfolds in a bustling metropolis where heart fragments are auctioned to the highest bidder. As the characters delve deep into a sinister plot involving a mysterious heart thief disrupting the emotional economy, players must navigate moral choices, confront their own emotional demons, and uncover the truth behind a heart that holds the power to change the world. The choices they make will influence the fate of the city, as well as the emotional connections they forge or break along the way.