A retired boxer known only as "The Boxer" is haunted by a career-ending injury from a decade ago. When a sudden opportunity for a title fight arises, he enlists an unscrupulous trainer, Boz, to help him make weight in just six days. The film focuses on the brutal, illegal weight-cutting process that pushes him to physical and psychological breaking points, forcing him to confront suppressed childhood trauma as his reality begins to unravel.