In a world where hearts can be magically swapped between individuals, you play as an amateur heart mechanic who has accidentally mixed up the hearts of various citizens in your town after an experimental failed procedure. Each heart carries the emotions and memories of its previous owner. You must navigate the intricacies of relationships, solve personal puzzles, and engage in intense dialogues to restore the right hearts to the right people while uncovering hidden motivations and secrets along the way. Every choice you make colors the outcomes, leading to unexpected and dramatic twists.