What Your Wings Are For
Prince Triam comes to Earth to look for Valkyrie. He finds out that Valkyrie has turned into a child because she gave half of her soul to Kazuto, and so he tries to take that half back from Kazuto.
Aired 25/07/2002EP 4 - What Your Wings Are For
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)