The main characters are Naoto Azuma and Takuma Fujii, two young pro wrestlers. They were trainees at a small wrestling organization called Zipangu pro wrestling, but it wound up getting crushed by the wicked pro wrestling organization Tiger’s den. In retaliation, Naoto trains at the base of Mt. Fuji and becomes the new tiger mask, and Takuma meanwhile deliberately joins Tiger’s den and becomes Tiger the dark. The legacy left behind by the original Tiger mask is inherited by a new wrestler…!