Fate/stay night: Heaven's Feel II. Lost Butterfly

As the Fifth Holy Grail War escalates, Shirou Emiya remains committed to his ideal of heroism, striving to save everyone caught in the turmoil. His quest leads him to confront a sinister dark shadow responsible for a series of brutal killings. Meanwhile, Shinji Matou plots against Shirou, using his sister Sakura as leverage. In a desperate attempt to free Sakura from her brother's grasp, Shirou and Rin Tohsaka engage Shinji in a fierce battle. As tensions rise, shocking revelations about the Matou siblings' troubled past come to light, revealing a web of dark secrets that could change everything.