Amnesiac Tsukumihara Academy student Hakuno Kishinami survives a sudden supernatural attack and forms a pact with a red-clad woman calling herself a Servant, becoming a Master drawn into the Holy Grail War. Alongside classmates like Rin Toosaka, Hakuno must fight through the war's ranked matches while piecing together fragments of a forgotten identity. This manga adapts the setup of Type-Moon's Fate/Extra game.