Al is a human stranded in Cornelica, a sanctuary where succubi lure men to drain their vitality. Though he is aided by a young succubus named Lily, Al constantly finds himself targeted by the town's seductive inhabitants. From a trick played by his employer Hakura to a dangerous mishap at a local bar, Al struggles to survive the relentless advances of the succubi while Lily fights to keep him for herself.
Al continues his precarious life in the succubus town of Cornelica, attempting to be helpful despite the constant risk to his vitality. He first assists Hakura, the head of the church, in a "milk production" process that leaves him physically drained, before agreeing to help Arune, a magic item dealer. Arune uses Al as a test subject for her "Puppet Controller," a device that strips him of his autonomy and forces his body to satisfy her desires through a series of rigorous physical tests.
Seeking a way to be more independent, Al takes a job at a bar, only to be seduced and drained by the flirtatious Rosary. When a worried Lily finds him in this state, her possessiveness takes over. Determined to erase the influence of other succubi and secure Al's loyalty, Lily claims him as her own in an intense encounter, insisting that both his heart and body belong solely to her.
Al is invited to a banquet at Rosary's bar by Arune, only to find himself the target of a group of succubi using magic potions and puppet controllers to drain his vitality. Though Lily and Hakura arrive to rescue him, their own competitive desire to satisfy Al leads to another exhausting ordeal, leaving the human completely spent once more.