Fate/kaleid liner Prisma☆Illya: Vow in the Snow

In a parallel world facing inevitable destruction, Shirou Emiya and his adoptive father, Kiritsugu, rescue a young girl named Miyu from the ruins of a city. Although she possesses immense power that could save humanity, Shirou chooses to treat her as a younger sister rather than a tool for salvation. This peace is interrupted when the Ainsworth family kidnaps Miyu to use her as a sacrifice. Shirou must then struggle to rescue her while grappling with the reality of her destructive capabilities and the moral cost of his actions.

Directed by Shin Oonuma, this animated fantasy drama serves as a prequel to the first season of the Fate/kaleid liner Prisma☆Illya series. It is the first of three films directed by Oonuma in this series, followed by Prisma☆Phantasm and Licht Nameless Girl. The voice cast features Noriaki Sugiyama as Shirou Emiya, Kaori Nazuka as Miyu Sakatsuki, and Rikiya Koyama as Kiritsugu Emiya. The production involved companies such as Lantis, KADOKAWA, TYPE-MOON, and SILVER LINK.

The film earned 1 million USD at the worldwide box office. It has received generally positive feedback from viewers, holding a rating of 6.6/10 on IMDb based on 357 votes and a 7.1/10 on TMDB from 30 votes.