I didn't trust adults, and I hated my parents and my sensei. I didn't want to be a delinquent, but most of the bad guys were my friends. Then one day, a temporary sensei named Mari Yamaguchi came. I was planning to bully her and make her quit, just like my previous homeroom teacher Tsukada. But Mari Yamaguchi was no ordinary sensei. She had big breasts and a big ass, and was strong-willed, but she also had a kind heart that embraced me... I gradually became fascinated with Yamaguchi-sensei.