Fate/Stay Night: Heaven's Feel I. Presage Flower
[Fate/Stay Night spoilers]
The story of the film revolves around Sakura Matou, the younger sister by blood to Rin Tohsaka, but when she was young, Sakura was sent to the Matou household as an adopted daughter. There, she was given torturous training in order to give her powerful magic powers. Sakura was not supposed to enter the Holy Grail War, but due to her getting into a romantic relationship with Shirou, the passion hidden within herself and her mental restraints go berserk. Sakura becomes a large game-changer in the Holy Grail War, and forces Shirou to walk toward a cruel fate.
[Source: Anime News Network]