Ep. 1: Crown Princess Astarotte Agrees to Form Harem with Human Male Naoya

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Succubi sustain themselves by draining life essence from male partners. Astarotte Ygvar, the crown princess, despises men but faces intense pressure from her chief of staff, Judit, to establish a harem. She reluctantly agrees to begin with a human male. Humans are regarded as mythical in the Creature World, with no sightings recorded for one thousand years. Judit travels to the human realm and returns with Naoya Tōhara, a twenty-three-year-old man. Naoya accepts the proposal to become the first member of Astarotte's harem, despite the princess's initial reluctance and the rarity of human existence in her world.