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: ANN)+ More
Characters & Voice Actors

Touhara, Asuha
Main
Tamura, Yukari
Japanese
Touhara, Naoya
Main
Satou, Rina
Japanese
Ygvar, Mercelida
Main
Minaguchi, Yuko
Japanese
Ygvar, Astarotte
Main
Kugimiya, Rie
Japanese
Asgrim, Mistrune
Supporting
Matsuki, Miyu
Japanese
Austri, Lucca
Supporting
Hatano, Yui
JapaneseRecommended for you
Flint the Time Detective
TV
25m
Memories Off 2nd
OVA
30m
I Don't Like You at All, Big Brother!! Special
Special
23m
Seiren
TV
24m
Blessing of the Campanella
TV
24m
Wo Kai Dongwuyuan Naxie Nian
ONA
13m
Leviathan: The Last Defense
TV
20m
Otome Youkai Zakuro Picture Drama
Special
15m
Rinne no Lagrange Season 2 Specials
Special
3m
The Tatami Galaxy Specials
Special
7m
Nozomi Witches
OVA
52m
Popotan
TV
24m
Sky of Connection
TV
25m
Cinderella Boy
TV
25m
My Girlfriend is Shobitch
TV
23m