A moment of rest from the fierce battle with Ainsworth. Ilya and the others who rescued Miyu are informed by Shiro Emiya of the parallel world about Miyu's past and the Holy Cup War that occurred in this world. It was Miyu's sad fate, and it was the story of a fierce battle that her brother Shiro fought for Miyu's life. Ainsworth sacrifices Miyu to save humanity. Shiro decides to become the enemy of the world for Miyu. Ilya vows to protect everything in two conflicting justices. "I'll help. I decided to find a way to help everyone!" To create a tomorrow where you can laugh with your loved ones―.. The battle of magical girls begins again ...!