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Fate/kaleid liner Prisma Illya: Vow in the Snow is a Japanese animated fantasy film prequel of the manga Fate/kaleid liner Prisma Illya by Hiroshi Hiroyama, released on August 26, 2017. The film stars multiple voice actors including Noriaki Sugiyama, Kaori Nazuka, Rikiya Koyama, Natsuki Hanae and Noriko Shitaya for the main characters. The plot follows a teenager named Shirou Emiya who becomes involved in the mage conflict known as the Fifth Holy Grail War to protect his foster sister, Miyu Satsuki, from being used as a sacrifice by the Ainsworth clan.