Yoshiko (Shiratori), the wife of the Kitayama family, has to take care of her nephew Hiroshi, a college student, because of her sister's husband's sudden transfer. One night, Hiroshi is drawn to the voices leaking from the bedroom and peeks into the night life of Yoshiko and his wife. SEX that can not be imagined from Ryoko's elegant and graceful appearance. Just as Hiroshi was conscious of Yoshiko, Ryoko was conscious of Hiroshi. “The mind and body have become completely masculine…” A different atmosphere from the past surrounds the two. At that time, my aunt and nephew crossed the line...