King of the Iron fist school

Alan Contreras, a transfer student from the United States, enters a Japanese high school where every student knows a martial art or fighting style. He brings training in Muay Thai, Jeet Kune Do, and boxing, but hides a secret power that makes his body move on its own, turning him faster and stronger. A dangerous rival, a final boss, and several love interests pull him into escalating fights and a possible harem.