Tsubaki is a mother whose son has recently begun showing interest in men, despite repeatedly arriving late to work herself. Determined to help him become a real man, she decides to provide him with sex education, teaching him about a woman's allure and how to treat one. Her method is a strict, hands-on demonstration using her own body, starting with how to kiss and gradually escalating to more intimate acts. Through this rigorous instruction, her son grows stronger and more confident, leading Tsubaki to build a new, intimate relationship with him.