Tokino Bathhouse Space Annex
During the battle the asteroid is shot and a hot spring gushes from it. It also has a healing effect of curing souls, and Valkyrie's soul is healed by this hot spring. Now that she is healed, she no longer needs to be with Kazuto.
Aired 12/09/2002EP 11 - Tokino Bathhouse Space Annex
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)