A shy transfer student named Mukako accidentally farts during class one day. Unable to speak up due to her timid nature, she endures the teasing from her classmates. This event sets off a chain reaction where Mukawa not only gets gangbanged by her peers but also by their teacher. She experiences forced enemas, golden showers, and even anal reversion with urine. Her lunchtime becomes filled with humiliating acts like milk enemas and creampies left behind after school lunches. Despite being treated cruelly, Mukawa transforms into the class slut, satisfying everyone's desires while becoming a living example of sexual punishment and selfish cravings.