he story revolves around a sexually awakening adolescent son who begins to view his beautiful mother, Reiko, in a more womanly light. One day, he accidentally witnesses her engaging in intimate relations with another man, which shocks him but also intensifies his own budding desires. Sensing her son's confusion and growing urges, Reiko takes it upon herself to provide "real sex education" out of maternal responsibility, leading to a series of taboo, hands-on lessons that explore themes of forbidden attraction and familial intimacy. The film emphasizes emotional depth alongside explicit content, highlighting Reiko's mature allure and the son's journey into adulthood.