Ray Hua works as a space attendant for Cetacea Aviation during a commonplace era of space travel. This role demands proficiency in hand-to-hand combat to counter hijackers who weaponize their bodies on interstellar flights. Ray operates as part of the flight crew alongside colleagues Aoi Musashino and Lily Cooper. While Aoi Musashino self-identifies as unskilled despite her position, another space attendant named Yasaki interacts with a boy named Laika, who believes his songs bring misfortune.