A burnt-out salaryman's life is ruined when he is framed for groping on a women-only train. Recruited by a veteran known as the "God of Groping," he is initiated into a secret society that treats the act as a disciplined art form. After mastering various techniques and passing rigorous tests, he faces his final graduation challenge: targeting someone he knows, only to find that his target may be just as depraved as he has become.
Reiko reflects on the trauma of her college years, where forced encounters on a train left her with a compulsive physical response to groping. This experience led her to an unusual apprenticeship under a master of the craft, who trained her in the specific techniques of the act. Following her mentor's death, Reiko inherits his legacy and the final secrets of the art, fully embracing her identity as a skilled practitioner.