UFO Ultramaiden Valkyrie

Overview:

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)

AniWatch is the best site to watch UFO Ultramaiden Valkyrie SUB
online, or you can even watch UFO Ultramaiden Valkyrie DUB in HD
quality.

You can also find

TNK

anime on AniWatch website.