Fate/Extra Last Encore

Hakuno finds himself fighting for survival in a conflict he doesn't comprehend for a prize beyond value: the chance to have one's desire granted after waking up in a strange virtual world with no memory of the past. Hakuno Kishinami will have to engage in life-or-death combat with both allies and enemies with just a mystery "Servant" by his side in order to not only obtain the cryptic object known as the "Holy Grail," but also to learn the answer to the most crucial question of all: "Who am I?"