Fate/kaleid liner Prisma Illya is a spin-off of the popular Fate/stay night series, set in an alternate universe. It follows Illyasviel von Einzbern, a young girl who becomes a magical girl, and is tasked with collecting Class Cards, which contain the spirits of legendary heroes. The series combines magical girl elements with the familiar themes of the Fate universe, offering a unique blend of action, comedy, and drama.