In a quirky world where emotions can be externally manifested as animated heart-shaped creatures, players take on the role of Cass, an aspiring detective with a knack for piecing together clues. Cass comes across a bizarre case where several people have mysteriously exchanged their heart creatures overnight, causing chaos and emotional turmoil throughout the city. To solve the mystery, players traverse different neighborhoods, interact with eccentric characters, and engage in humorous dialogue choices. Each conversation reveals more about the complexities of love, identity, and relationships, leading players to unravel the deeper implications of 'heart-swapping' while also having to confront their own emotional baggage.