At a massage parlor in Tokyo, female newcomers are being trained by veteran massage therapists under the guise of learning proper techniques. However, the training gradually evolves into lewd and explicit massage sessions. The trainees, nervous and in a position of subordination, find it difficult to strongly resist. Initially, they humbly continue their lessons, thinking, "Is this just how it is?" but grow increasingly confused as the instructor's touch becomes more aggressive. Over time, the nature of their relationship begins to shift...