“…What should I do…I…I shouldn’t be doing this…with someone other than Naoya…” Yui and Naoya have just started dating, but their relationship isn’t progressing. Then, the man to whom Yui lost her virginity reappears. Yui is blackmailed with her past actions. And she finds herself accumulating more and more secrets that she can’t tell her boyfriend…

Desperate for some pocket money, Mizuka went to a part-time job today, intending to use her large breasts to earn some money through her “boob job.” However, she encountered a strange old man with an obsession with large breasts. She was confident she could make a fortune just by showing her breasts, but suddenly he began to fondle them. The intensity of the massage caused her body to react, leaving her weak. Excited by her weakened state, the man, thinking he could “boob fuck” her, thrust his penis into her chest…!?

Private Corondo Girls’ Academy is a prestigious girls’ school renowned throughout the land. However, despite sexual intercourse being mandated by law, sex education there is lagging behind. Kobayashi arrives at this girls’ academy as a sex education instructor. His job is to impart correct knowledge and techniques about sex. As a sex education instructor, he uses instruction as a pretext to devour the girls…