UFO Ultramaiden Valkyrie, aka UFO Princess Valkyrie, is an anime series that follows the story of Kazuto Tokino and the alien Princess, Valkyrie, who gives half her soul to Kazuto to save him after accidentally crashing her spaceship into Kazuto's family owned public bathhouse and nearly killing him. The splitting up of her soul turned her into a child, but whenever she kisses Kazuto, Valkyrie returns to her adult form for a limited time, and regains the use of her special powers.
Episode 1
Valkyrie and Kazuto are playing hide and seek. Kazuto finds Valkyrie sleeping in the spaceship. As he wakes her up Valkyrie accidently turns the switch on in the spaceship making it go haywire.
Episode 2
Valkyrie crashes on Kazuto, and gives him half of her soul. She comes to live with him and Akina and Rika do not like it. Hydra comes to Earth from Valhalla to bring Valkyrie back and Valkyrie and Kazuto hide, but Hydra finds them. Valkyrie transforms and fights him off until Akina is able to seal Hydra.
Episode 3
The head catgirl maid for Valkyrie, Sanada arrives on Earth. She sees the relationship between Akina and Kazuto, and decides to try to break up the relationship by turning Akina into an obedient catgirl maid.
Episode 4
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 Kazuki, and so he tries to take that half back from Kazuki.
Episode 5
The basketball star at Rika’s school confesses his feelings of love for Rika, but Rika turns him down because she is too busy studying for exams. Marduk has been hired to kidnap Valkyrie but his plans are foiled by Kazuto.
Episode 6
Ms. Sanada purchases a video camera through the Galactic Internet Shopping Page so that she can film Princess Valkyrie. She happens to film a scene where Valkyrie is playing with Hydra and accidentally activates the automatic defense system on Hydra’s UFO. Valkyrie and Hydra work together to stop the out of control UFO.
Episode 7
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.
Episode 8
The Catgirl maids suggest that they all go on a vacation at the beach. Laine decides to join them.
Episode 9
Akina accidentally turns herself small instead of Hydra when Laine crash lands on her. While she is a little kid she discovers how nice it can be to be a kid. She also manages to confess her feelings for Kazuto to Hydra and Valkyrie and wonders why she is unable to be as genuine and honest when she is an adult.
Episode 10
Valkyrie accidently buys an asteroid over the internet in Kazutos name; therefore the order can not be canceled. This means Kazuto would have to sell the bathhouse.
Episode 11
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.
Episode 12
Kazuto realizes that Valkyrie is not as strong as he thought and that the reason he can no longer connect with her from the heart is because he keeps seeing a shadow of an angel in Valkyrie.
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