This is the general thread for Fate/hollow ataraxia, meant for those who have played the game and wish to discuss it. Spoiler tags are not required.
Fate/hollow ataraxia (フェイト/ホロウアタラクシア, Feito/horou atarakushia) is a visual novel game created by TYPE-MOON in 2005 which 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 (or false) tranquility".
Source: Type-Moon Wiki