Puella magi Kazumi magica

"Trapped inside the witch's barrier with the vengeful Kanna, Umika and Kaoru struggle to protect Kazumi as their beloved friend slowly succumbs to her darkening soul gem. If the girls can rally, the witch's grief seed could be used to purify all of their gems, but even that would be only a temporary solution. Facing cruel fate and questions of her own identity, Kazumi will make the ultimate choice whether or not to join her friends in their vendetta against destiny"--Back cover.