An announcement by the Fate/Stay Night franchise today has confirmed at its stage at AnimeJapan 2016 that the Fate/Stay night Heavens Feel movie will not only be released sometime in 2017, but also be split into three separate films. Originally back in 2014 the series was announced as a single film only. A new PV was also released today for the upcoming film which will be showcased later in the article. It should be noted that the film will be adapting the Heavens Feel route of the Fate/Stay Night visual novel series, the visual novel consists of Fate/Stay Night, Unlimited Blade Works and Heavens Feel. A manga for the Heavens Feel route also started on May 2nd 2015 and is continuing publication.
Below is a plot summary of the upcoming film however please be mindful that it contains spoilers from Heavens Feel:
The story of the film will revolve around Sakura Matō, the younger sister by blood to Rin Tohsaka, but when she was young, Sakura was sent to the Matō 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 Shirō, the passion hidden within herself and her mental restraints go berserk. Sakura becomes a large game-changer in the Holy Grail War, and forces Shirō to walk toward a cruel fate.