In a world where people's hearts are literally swapped post-relationship, you play as a heart detective tasked with tracing the mystery of a stolen heart that belongs to a recently broken-up couple. As you navigate through a bizarre city populated by the heartless (people who have lost their hearts but retain their memories), you will engage in dialogue-driven quests, solve emotional riddles, and uncover hidden truths about love, betrayal, and identity. Each interaction influences the outcome as you seek to return the heart to its rightful owner, all while navigating your own tangled emotions.