The reason why Risaki, a problem child who had been refusing to go to school for a long time, decided to participate in the school trip was to repay his homeroom teacher, Sachiko, who had cared for him more than anyone else. He was determined to seize the opportunity to confine her voluptuous, busty body, which not only captivated the adolescent male students but also ensnared their parents and male teachers. Late at night on the first day of the trip, after confirming that Sachiko was heading to an outdoor bath alone, Risaki quickly stripped off her clothes in the changing room and, from behind, began to knead her large bust. "Risaki-kun! What are you doing!?" "It's okay, it's already time for everyone to be asleep..." Thus began the long yet fleeting unforgettable three days for the two of them.
