Illyasviel von Einzbern is an ordinary elementary school student who loves magical-girl anime until the talking Kaleidostick Ruby tricks her into a contract and gives her magical powers of her own. Her peaceful life abruptly becomes a series of missions tied to mysterious Class Cards and familiar figures from another version of the Fate world. Illya must learn how to use the role she never asked for while balancing school, friendships, and increasingly dangerous magical battles.