Hikari, who moved to Tokyo for work, entered into a long-distance relationship with her boyfriend from her school days, and started her new life as a member of society, still ignorant of sex. Unaccustomed to being around men, Hikari is skillfully seduced by her senior, Oki, and, though confused, is taught the pleasures of sex. Dripping with pleasure, Hikari gradually grows into a voluptuous woman, using her young body to take advantage of men's desires and transform into a woman who takes the lead.