あらすじ
Just as Miyu was about saved from being swallowed into despair, all of a sudden a mysterious small duo that has mastered the Class Cards suddenly appears in front of the Illya? These witches are taking things to the next level!
あらすじはAniListより（英語）。
プレビュー
アニメ版より：Fate/kaleid liner Prisma☆Illya 3rei!!