Hashire! Nekketsu Keiji(1980)

Hashire! Nekketsu Keiji is a Japanese detective drama centered on a former delinquent turned detective who works out of the Aizumi Police Station. As juvenile crime rates spike across the region, he throws himself into the fight against young offenders, drawing on his rough past to connect with troubled kids and uncover the truth behind their crimes. The series balances gritty police work with the detective's personal struggle to leave his delinquent days behind while using that experience to make a real difference. It's a character-driven crime drama that explores redemption and second chances against a backdrop of escalating youth violence.