Fate/kaleid liner Prisma☆Illya: Vow in the Snow is an anime film that premiered in summer 2017, produced by SILVER LINK..

About the production: the story comes from a manga, the film runs about 89 minutes and its current status is "finished".

Its main genres are action, drama, fantasy and psychological, with themes such as Tragedy, Shounen, Henshin and Mythology.

On AniList, Fate/kaleid liner Prisma☆Illya: Vow in the Snow has an average score of 78%, a very good score, and appears on 31,847 users' lists.

The franchise continues in or follows from: Fate/kaleid liner Prisma☆Illya: Licht - Namae no Nai Shoujo and Fate/kaleid liner Prisma☆Illya 3rei!!.

Despite his adoptive father's warnings that the girl found in the remnants of a destroyed city is too dangerous to be considered anything other than a tool or weapon, Shirou Emiya comes to treat Miyu as a younger sister. But when Shirou relaxes his guard and Miyu starts normal school, the Ainsworth family and their agents swoop in, kidnapping the girl with the goal of sacrificing her! Faced with the realization that Miyu's ability to do good will always be equaled by her capacity for destruction, Shirou must attempt to both rescue his adopted sister, and decide how to confront the threat that her powers will always pose. (Source: Sentai Filmworks)

Official synopsis from AniList.