蒼天の拳 REGENESIS

Kenshiro Kasumi teaches in Tokyo and carries Hokuto Shinken, the assassination art that made him the figure Shanghai remembers as Yan Wang, the King of Death. In a city split between foreign concessions and rival triads, a girl named Erika loses her family and ends up with the martial artist Liu Fei-Yan, who keeps running out of people willing to shelter her. Regenesis picks up from the earlier Fist of the Blue Sky anime instead of restarting it, decades before the events of Fist of the North Star.