Yoshimura, a former coach of the synchronized swimming club, had been dismissed from his post six months earlier for corporal punishment of a student. His student Ellen, who worships Yoshimura, comes to his house and asks him to teach her synchronized swimming. Yoshimura's training gradually develops into a distorted form, and Ellen, unable to control her sexual urges, begins to engage in lewd and insidious acts of indecent assault.
