1x2 - UFO Ultramaiden Valkyrie

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.