Действието се развива 30 години след събитията от турнира по карате "All Valley" през 1984 година. Джони Лорънс иска отмъщение и отваря известната тренировъчна зала по карате "Кобра Кай". Това възобновява старото му съперничество с Даниъл ЛаРусо, който се опитва да запази баланса в живота си без ментора г-н Мияги.
One day, 14-year-old Yusuke Urameshi suddenly finds himself dead, having died pushing a child out of the way of oncoming traffic. Since he has such a bad personality, even the Spirit World was caught by surprise that he would sacrifice himself. Yusuke soon finds out he wasn't supposed to die and has a chance for resurrection and bringing his body back to life. After being resurrected, Yusuke becomes a Spirit Detective, along with his comrades, and one adventure after another happens, whether it be an investigation or a fighting tournament.
After 2 and a half years Naruto finally returns to his village of Konoha, and sets about putting his ambitions to work. It will not be easy though as he has amassed a few more dangerous enemies, in the likes of the shinobi organization; Akatsuki.
Actor and fight enthusiast Frank Grillo travels the world, immersing himself in different fight cultures to understand their traditions and motivations.