Fate/stay night [Unlimited Blade Works] - Season 0

This story focuses primarily on the heroine Rin Tohsaka. After her father’s death, Rin enters the Holy Grail War as the sole heir to the prestigious Tohsaka Household, with her servant Archer. But, she soon finds out that Shirou Emiya, a boy from her high school has gotten himself involved in the battles and unexpectedly saves him when he is fatally injured. Before long, Rin sets out to strike down the conspiracies surrounding the Holy Grail War along with Shirou and his summoned servant Saber. And so, the story begins to explore the truth behind Shirou’s powers and the nature behind his unyielding will to become a “hero.”