Astarotte's Toy

Succubi are a race of beings who survive by having a harem of men from which they can suck 'life essence' from. However, Astarotte Ygvar, the crown princess, hates men. Under relentless pressure from Judit, her chief of staff, to grow up and start building her harem, she agrees to start but only with a human male. In the Creature World, humans are considered mythical creatures, with none having been seen in a thousand years. To her dismay, Judit manages to travel to the human realm and return with a 23 year old human male named Naoya Tōhara, who accepts the offer to found Astarotte's harem.

Naoya is introduced to Astarotte, but she refuses to get along with him. Naoya learns that when Astarotte was young, she witnessed her mother, Mercelída Ygvar I, engage in intimate acts with a member of her harem. From this, she developed a dislike for men and grew distant from her mother. Wanting to be able to make her feel less alone, Naoya makes a replica of Astarotte's favourite doll. The next day, Astarotte agrees to accept Naoya into her harem, on the condition that he be her 'toy'.

Naoya brings his ten year old daughter, Asuha, to the Creature World. Upon learning their ages, Astarotte grows upset since it would mean he had sex when he was twelve, though Asuha is quick to jump to Naoya's defense. Wanting to apologise to her, Asuha enrols into Astarotte's school, where she makes some new friends, Mist, Yuna and Lucca, who mention they haven't had the courage to be friends with Astarotte. As Asuha makes up with Astarotte, rumours spread about a 'human male' on campus, which turns out to be a rampaging llama from a zoo. As it goes wild, Mist, Yuna and Lucca step in to defend Astarotte before Naoya manages to calm it down. Afterwards, Astarotte manages to make friends with the other girls, who nickname her 'Lotte'.