Illyasviel von Einzbern, an ordinary teenager with a passion for magical girl anime, has her life transformed when an enchanted wand, Ruby, chooses her as its new master. Now equipped with magical powers and a new persona, Prisma Illya, Illyasviel must navigate her newfound role as a magical girl. However, this change comes at the cost of displacing Ruby's former owner, the skilled mage Rin Toosaka. Tasked with collecting magical energy cards scattered throughout Fuyuki City to avert disaster, Illyasviel must juggle her secret identity and her everyday life. As Prisma Illya, she faces the challenge of balancing her adolescent struggles with her mission, pondering whether the thrills of her magical transformation are more than she can handle.