To the Princess's Side (S04E10)

"I'll save both Miyu and the world!!" But for Illya to realize that wish of hers, she'll have to first rescue Miyu from the Ainsworths' clutches. While Illya is forced to face a fierce battle, Gil and Bazett appear out of hiding to overturn their disadvantages. At long last, Illya's reunion with Miyu draws close! (Crunchyroll)