The Gokusen(2004)

The Gokusen is a Japanese comedy-drama series following Kumiko "Yankumi" Yamaguchi, a math teacher assigned to the most troublesome class at Shirokin Gakuen Private School. Populated by delinquents determined to test her patience, class 2-4 initially dismisses her authority. Yet Yankumi quickly earns their respect through her unconventional methods and genuine care. What the school doesn't suspect is that beneath her teacher's facade lies a dangerous secret: Yankumi is the heir to the Oedo Group, one of Japan's most powerful yakuza families. Balancing her dual identity becomes increasingly difficult as she navigates classroom challenges while concealing her criminal underworld connections. The series blends humor, heart, and tension as Yankumi juggles her responsibilities as an educator with the expectations of her yakuza legacy, all while keeping her true identity hidden from colleagues and students alike.