Two innocent middle school girls, Kana and Asuka, are taken into a man's room, unaware of the true nature of their own bodies, and are drawn into lewd acts. Their underdeveloped bodies are toyed with as they nervously experience their first sexual encounters, gradually accepting the man's cum. Bound and blindfolded, they undergo blowjob training and other humiliating experiences, trembling with fear at each new sensation—yet slowly succumbing to pleasure. Through this process, they begin to transform into women. This is the story of their first experiences, and the physical and emotional changes that mark their passage from girlhood to adulthood.