Revenge of the Skull Ninja

Synopsis

At the scene of a smuggling crime, a shady man calling himself Skull Ninja appears. After seeing Skull Ninja on the news, Ron seems to recognize something, skips class, and vanishes. Worried, Burton and the others hack into Ron's records from his Oniwaban days to investigate. Meanwhile, Ron gets information about Skull Ninja from a broker and tries to make contact, but...