Kaleid Liner Prisma Illya-1R
The Holy Grail War ended before it even started. The vessel for the Grail was sealed and disappeared, and as a result the Grail War simply never was. All because of Kiritsugu Emiya and Irisviel von Einzbern fleeing with their daughter.
Illyasviel von Einzbern was meant to be that vessel. Her body was meant to become the Holy Grail. But given the chance to live an ordinary life, she never learned of this until much later, when granted the powers of a Magical Girl by the Kaleidostick Ruby. Tasked with gathering the Class Cards from Fuyuki city before they could cause havoc, Illya was thrust into a world of magic she never even knew existed.