The reason why Satozaki, a problematic child who had been refusing to go to school for a long time, decided to participate in the school trip was to rape his homeroom teacher Sachiko, who had been more concerned about Satozaki than anyone else. He was looking for an opportunity to get his hands on Sachiko's lewd, busty body, which not only attracts the attention of adolescent boys, but also captivates their parents and male teachers... Late at night on the first day of the trip, Sachiko saw Sachiko heading to the open-air bath alone, and in the dressing room, she took off her clothes and exposed Sachiko large breasts, which he squeezed from behind in one go. "Satozaki! What are you doing!?" "It's okay, everyone is already asleep..." The long, short, and unforgettable three days for the two of them began.