The twenty-year-old Lumi lives in the land of eternal winter. Once in her life, she wants to experience the legendary realm of the Seraphim above the clouds. She knows she must not enter the land of the angels, but seeing it from afar just once is her greatest dream. To achieve this, she signs on as a dancer on a large airship that offers wealthy guests from Araboth a luxury cruise above the clouds. Night after night, she and other human women perform an extravagant, erotic show for the male Seraphim on board. It's during this time that she meets Cassiel, but he could never be with her because she is human. Only a brief affair for the duration of the journey is an option for him. However, he has specific preferences: He wants to dominate Lumi. Lumi decides to play along, only realizing much too late that she has fallen deeply in love with the angel, while he sees her merely as a passing amusement.