The OVA Astaroette no Omocha is a three part short story series. In the first story, Lotte and Asuha find themselves searching for details about their school project. In the second bit, is the backstory to how Zelda came to be Lotte's bodyguard. The final of the three, is a flashback of how the queen met Naoya and how they conceived Asuha ten years prior to the events in the anime.
 
(Source: Anime News Network)

In the medieval fantasy world of Alfheimr, succubus princess Astarotte Ygvar, the first princess of the kingdom of Ygvar, has just reached the age of 10. For the coming years of a young succubus' life, it is necessary for them to have a male harem. In order to maintain their body and preserve their beautiful appearance, they must consume a substance only found on males. This substance is a liquid called "Sauzfryma", better known as semen. The princess, however, bears a great dislike against men, and only agrees to create a harem if a human male is to join. 
In the human world Midgar, young father Touhara Naoya was greeted by a suspicious lady one day, claiming that she is a fortune teller. She also claims that she can help him find the "perfect job" fitted for him. Even though it seems suspicious, he accepts the free consultation in order to support himself and his young daughter. After meeting in the park with the suspicious lady a day later, he suddenly found himself in Alfheimr, a medieval fantasy realm located on a different world. The mysterious lady uncloaks her true identity as the Head Chamberlain of the kingdom of Ygvarland. He was then lead to the palace of Ygvarland, and there, the "job" he accepted was finally revealed; he was to become a human candidate for princess Astarotte's harem. 
(Source: MangaHelpers)

While job hunting, Naoya is taken by a mysterious girl to a magical land where he is installed in the harem of the succubus Princess Lotte. Thanks to trauma from her childhood, Lotte hates men and surrounds herself with lots of other women, who all have quirks of their own. In spite of her selfishness, when Naoya learns that Lotte is really quite lonely he agrees to stay in her world ...if he can bring his daughter Asuha with him.
 
(Source: Anime News Network)

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