Matsumoto, a problem child who had been absent from school since the start of the new semester, decided to take part in the school trip... It wasn't because he felt like going to school, but because of the voluptuous body of his homeroom teacher, Mami, who was the only one who cared about Matsumoto. He had been waiting for the right opportunity to get his hands on her voluptuous, jiggling breasts that would captivate any man, no matter what. On the night of the first day of the school trip, Mami came over to Matsumoto, whom he hadn't seen in a while. "Why don't you come to school soon? Everyone's worried about you," she said, "...If you can teach us something other than academics..." Matsumoto couldn't hold back any longer, so he embraced Mami and buried his face in her defenseless breasts...