Sukeban Deka(1985)

Sukeban Deka is a Japanese action series following Saki Asamiya, a delinquent recruited by the government to fight crime and redeem herself. Posing as a student, she infiltrates high schools across the country to dismantle gangs and criminal networks from within. Armed with a metal yo-yo badge as her signature weapon, Saki navigates the dangerous underworld of teenage crime while maintaining her cover. The series blends school-based drama with hard-hitting action sequences, exploring themes of redemption and duty. Saki must balance her mission as an undercover officer with the complex social dynamics of student life, all while confronting criminals far more dangerous than her troubled past.