A female college student falls into a creampie soapland

Ayumi is an honest, pure, and serious female college student... she visits a frightened sex shop and is given an astonishing practical instruction interview that same day...but she still doesn't know about it. The selling point of this shop is that raw creampies are OK without a condom... and regrets coming to the shop and tries to escape, but is caught, and her expression is distorted, forcing a customer to serve her with creampies.