UFO Princess Valkyrie

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UFO Princess Warukyure, aka UFO Princess Walküre 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 Walküre`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)