The Tsukiyama Family Extermination Operation (月山家駆逐作戦, Tsukiyama-ke kuchiku sakusen) is an operation launched by the Commission of Counter Ghoul to eliminate the members of the wealthy Tsukiyama family. The initial operation was focused on the Tsukiyama Estate, with the goal of exterminating the president of the Tsukiyama Group and his family. It later moved to the Lunatic Eclipse Building, with the goal of exterminating the Tsukiyama heir apparent and the ghouls who associate with them.