20-year-old Hiromi has always believed that "penises that pee are dirty" and "female genitals are dirty, so I don't want to be touched there." Despite her pure, black-haired appearance, these deep-seated misconceptions have lingered strongly within her. Now, she faces the challenge of losing her virginity by inserting a penis into her vagina for the first time. Underlying this act is her lingering question: "Aren't genitals dirty?" Having always avoided genital contact in past relationships due to her belief that sex organs are unclean because they are used for excretion, Hiromi decides at age 20 to make a fresh start and finally engage in her first sexual experience. Watch closely as Hiromi, resolved to shatter her innocent image, takes this bold new step.