In a future not too distant, the game "Rhyme" has become very popular and many individuals have access to "AllMates," advanced AI computers. Despite living an average existence working at a thrift store and residing with his grandmother on Midorijima Island, Aoba differs from his peers who engage in Rhyme or are part of a gang. However, when rumors surface about people vanishing, Aoba feels compelled to investigate the island's secrets to safeguard his daily routine.