Runaway Princess Laine
Laine, another princess of Valhalla lands on Earth. She is in love with Valkyrie, and when she finds out that Valkyrie is staying on Earth because of Kazuto, she decides to try and break them up. She decides to do this by transforming into the females around Kazuto in order to seduce him.
Aired 15/08/2002EP 7 - Runaway Princess Laine
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)