D.S.O. agent Leon S. Kennedy is on a mission to rescue Dr. Antonio Taylor from kidnappers, when a mysterious woman thwarts his pursuit. Meanwhile, B.S.A.A. agent Chris Redfield is investigating a zombie outbreak in San Francisco, where the cause of the infection cannot be identified. The only thing the victims have in common is that they all visited Alcatraz Island recently. Following that clue, Chris and his team head to the island, where a new horror awaits them.

Featuring stories from the manga not adapted in the main anime.

In a Holy Grail War, Mages (Masters) and their Heroic Spirits (Servants) fight for the control of the Holy Grail—an omnipotent wish-granting device said to fulfill any desire. Years have passed since the end of the Fifth Holy Grail War in Japan. Now, signs portend the emergence of a new Holy Grail in the western American city of Snowfield. Sure enough, Masters and Servants begin to gather... A missing Servant class... Impossible Servant summonings... A nation shrouded in secrecy... And a city created as a battleground. In the face of such irregularities, the Holy Grail War is twisted and driven into the depth of madness. Let the curtain rise on a masquerade of humans and heroes, made to dance upon the stage of a false Holy Grail.