Fate/kaleid liner Prisma Illya 3rei!!

Synopsis

In an alternate version of Fuyuki City, Illyasviel "Illya" von Einzbern wakes up confused and alone, finding her home destroyed and a massive crater at the center of town. Despite it being summer, snow covers the ground, leaving the young elementary school student disoriented as she has lost track of her friends and her wand, Ruby. When Illya reaches the remains of her house, she meets a girl with amnesia, wearing a gym uniform despite the freezing weather. This mysterious girl, known only as Tanaka, has no memory of her location or how she got there, but she seems to know where Rin Toosaka, Miyu Edelfelt, and Illya's other missing friends are. With the Ainsworth family, the rulers of this parallel world, chasing them, Illya and Tanaka must avoid their agents. Will these two find a way to restore the world to its original state?