Astarotte's Toy

Succubi, an all-female race distinguished by their ability to reproduce their kind through mating with males of any race, are both one of the oldest races in the Creature Realm and its rulers. An adult succubus sustains herself by sucking “life seed” from males in her harem, which presents a future problem for 10-year-old Princess Astarotte (aka Lotte), who has hated males since an unpleasant incident years earlier involving a member of her mother's harem; it is also the reason that she lives apart from the Queen. Judit, Lotte's chief servant, is concerned about her mistress's stubbornness, so she seizes on the first opportunity that Lotte gives her – Lotte's claim that she would accept a human man, which she thinks is a safe call since the gate to the Realm of Man has been closed for a thousand years – and finds a way to the Realm of Man, where she quickly recruits Naoya, a 23-year-old man on his way to a job interview, with an offer he can't refuse. Though reluctant to accept him at first, Lotte gradually gets won over by Naoya's kindness and officially makes him her toy. Naoya's extroverted daughter Asuha, who is about the same age as Lotte (yes, you read that right), eventually joins them in the Creature Realm and swiftly makes herself something that Lotte has never had before: a friend. No one is initially aware, however, that Naoya, Asuha, and Lotte are all actually connected in a much more complicated way than anyone could have imagined, or that that the royal status of Lotte's line is based in part on one of their more obscure special powers.