Sakiko remarried Toru, who has a son in high school. Sakiko tries to be a good mother in her new family, but her son Kaoru feels uncomfortable with Sakiko, whose pheromones are too strong as a woman rather than a mother. One day, when Kaoru returns home from school, he sees Sakiko having a friendly conversation with a courier, and his anger explodes. Sakiko exudes sex appeal that any man would care for, so Kaoru uses her mother, with whom she is not related by blood, as a tool for sexual desire...