Fate/kaleid liner Prisma Illya - S02

It has been a month since Illya and Miyu became magical girls and sealed all of the Class Cards. Rin and Luvia have been stuck in Japan to deal with the fallout, like the magic in the area's ley lines that is now unstable. While helping with the cleanup, the seal on Illya's mysterious innate magic goes out of control and she loses control of her transformation. By the time she realizes what happened, a mysterious girl who looks eerily like Illya shows up, apparently set on bringing destruction to the original whose heart she seems to have been born from, and to make things worse, she holds the power of the Archer Class Card, with which Illya shares a special bond, inside her body.