Astarotte's Toy

The princess of the monster country, Ygvarland, Astarotte is a succubus which requires sucking the "life-seed" from men to stay alive. She has just reached the age where she must create a harem to live, but Lotte hates men more than anything. Lotte gives the loud-mouthed head lady-in-waiting, Judit, the near impossible task of bringing her a human male. But Judit manages to open the World Tree's gate and travel to the Realm of Man. Who will she meet there?

Judit brought back a young man named Touhara Naoya from the Realm of Man. Lotte, who gave the original task of bringing a human male to their realm, decides to ask Naoya to attend to her that night. But Naoya spills a pitcher of milk as soon as he opens the door to Lotte's room. Naoya finds himself in quite the situation, as Lotte tells him to find new milk, and Naoya is unable to find milk that tastes similar to the one he spilled. It turns out that this was all Lotte's plan to make Naoya take the blame for what happened.

Naoya brings his daughter, Asuha, from the Realm of Man now that he has been selected as a candidate for the harem and is living with Lotte in their estate. Lotte is surprised that Naoya has a daughter at his age and unleashes a barrage of insults against him without realizing exactly what she's saying. Asuha, on the other hand, doesn't seem exactly pleased that her dad had a lot of bad things said about him. Naoya tells Asuha that, instead, he wishes for her to become friends with Lotte. The very next day, Asuha tries to look for Lotte in order to make amends, but she has already gone to school. Asuha says she wants to go to school too.

Lotte's school announces they are going to hold a parent-teacher party. Asuha hands the invitation to Naoya happily telling him to come no matter what, but Lotte has a depressed look on her face. Her father has passed away, and her mother, Mercelída the Queen, doesn't seem as if she'll be able to make it to the party, as she's really busy with her work. Asuha tells Lotte to deliver the invitation in person, and Lotte broods over the idea, but eventually works up the courage to go Mercelída castle the next day, but...

Mercelída sneaks into the manor to try to at least take a peak at Lotte sleeping, but she runs into Naoya. Naoya finds out something amazing--that Mercelída is actually someone extremely interconnected to Asuha and himself. Naoya states there something he must tell Mercelída and decides to take Asuha to go see her, but it's not a simple matter to sneak into the castle to see her, so seeking advice from Judit, he somehow ends up in possession of a maid uniform and...

Lotte is jealous that everybody is using Noayo, her new toy. Those feelings will lead to disastrous results.