Your girlfriend is crazy about me?

Chiyo Tochikura, an ordinary high school girl with slightly large breasts.
The day after experiencing a thrilling first time with her wonderful boyfriend, she gets drunk at a welcome party at her part-time job and is taken home by a senior.
Threatened by a sleazy freeter, her body is used as he pleases…
Can this big-breasted high school girl protect her pure love?! (She can’t.)