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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 Yamaguchi Mari came. I was planning to bully her and make her quit, just like my previous homeroom teacher Tsukada. But Yamaguchi Mari 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.