While working part-time at an izakaya, Shizuku Tsuki no accidentally spilled alcohol on a customer's pants and was sexually harassed, forced to wipe it off directly inside his pants. As a result, Shizuku was forcibly stripped naked, made to perform oral sex against her will, and made to receive ejaculation in her mouth. Afterwards, she was made to write down every detail of the incident on the blackboard, and soon became a test subject for "anal class" under the declaration, "Today's a special lesson!!" Her anus was exposed, licked, and invaded with nipple clamps and sex toys, mercilessly toyed with. Screaming in pain, Shizuku endured repeated penile insertions into her anus, pushed to the extreme limit of receiving 20 consecutive anal creampies.