A disillusioned insomniac office worker forms an underground fight club with a charismatic soap salesman. As the club gains popularity, it evolves into a violent anarchist movement. The protagonist becomes entangled in a complex relationship with a mysterious woman who also has ties to the fight club. As their actions become increasingly destructive, the protagonist begins to question his own sanity and the consequences of their actions. The story explores themes of masculinity, consumerism, and the search for identity in a modern society.