Animation movie Fate/kaleid liner Prisma☆Illya: Yukishita no Chikai (劇場版プリズマ☆イリヤ 雪下の誓い) has released the third trailer, which is presumably the last trailer before the premiere.
▼ Third trailer
▼ Second trailer
▼ First trailer
In Yukishita no Chikai, Miyu’s sacrifice in the Holy Grail war prompts Shiro and Illya to go back to where Shiro and Miyu grow up, and they start reminiscing the time when Shiro and Miyu live a peaceful life as brother and sister, as well as the changes after Julian shows up. Fate/kaleid liner Prisma☆Illya is an alternative universe spin-off manga by Hiroshi Hiroyama (ひろやまひろし).
Cast
Illyasviel von Einzbern: Mai Kadowaki
Miyu Edelfelt: Kaori Nazuka
Shiro Emiya: Noriaki Sugiyama
Julian Ainsworth: Natsuki Hanae
Sakura Mato: Noriko Shitaya
Kiritsugu Emiya: Rikiya Koyama
It will premiere on 26th August, 2017.