Souten no Ken Re:Genesis (2018) - Fist of the Blue Sky: Re:Genesis
The main protagonist of this story is Kasumi Kenshiro, better known as "Yan Wang" or "The King of Hell" (derived from the myth Yan Luo Wang). Kasumi is a laid back and chain-smoking Tokyo professor who is secretly the successor of the deadly Chinese assassin martial art Hokuto Shinken that travels to Shanghai, China after hearing that his Triad friend Pan Guang-Lin and Pan's sister Yu-Ling are in trouble.
In Shanghai, Kasumi fights the three Hokuto families, the Hokuto Sankaken (based on the royal families of Romance of the Three Kingdoms). At the same time he helps Pan's Qīng Bāng triad against their rivals, the immoral Hóng Huá Huì, in gaining territory and influence in Shanghai.