A technological hell masquerading as paradise, Tsukimihara Academy is an artificial high school that serves as the setting for the next Holy Grail War. Created by the Moon Cell computer, the school is inhabited by Earth-projected souls who have even the slightest aptitude for being a Master. Of these 256 souls, 128 will be chosen for the main tournament and granted a Servant. With all of the Masters selected, the Academy activates a purge, targeting the remaining lifeforms for elimination.