Fate/Extra: Last Encore

Tsukimihara Academy looks like a normal school, but it is actually a selection ground created by the lunar supercomputer Moon Cell for Masters entering a Holy Grail War. Hakuno Kishinami awakens with almost no memory and finds himself hunted inside a system that mercilessly erases those who fail to qualify. After summoning a flamboyant red Saber, he survives and begins climbing through the layers of the war. Each floor contains another Master, another Servant, and another fragment of a world that has already gone terribly wrong. Hakuno is not fighting for a wish he understands. He is fighting to learn who he is and why a powerful hatred was the one feeling that awakened with him.