A Page out of Rika's Youth
The basketball star at Rika’s school confesses his feelings of love for Rika, but Rika turns him down because she is too busy studying for exams. Marduk has been hired to kidnap Valkyrie but his plans are foiled by Kazuto.
Aired 01/08/2002EP 5 - A Page out of Rika's Youth
2002
UFO Ultramaiden Valkyrie
UFO Princess Warukyure, aka UFO Princess Walkyrie is about a princess from outer space who accidentally crashes on earth, where Kazuto desperately tries to maintain the public bath of his grandfather. Due to circumstances, Kazuto receives part of princess Walkyrie's soul which forces her to stay there with him. But that's not the only problem ... because her soul lost strength, the princess transforms both mentally and physically into a little kid!
(Source: AniDB)