Fate/Stay Night is a visual novel that chronicles a war between seven Magi for the Holy Grail. Each Magus summons a heroic spirit from history or legend to help fight with them and obtain the power to grant wishes.
Fate/Hollow ataraxia is the sequel to Fate/stay night. The word "ataraxia" in the title is a Greek term for "tranquility", giving the title the combined meaning of "empty tranquility".