Tatsuo Aku, the vigilante wrestler Tiger Mask II, inherits his identity from the late Naoto Date, vowing to combat injustice as his idol once did. Orphaned at Komadori Academy—alternately called Chibikko House—he balances a daytime career as a mild-mannered sports journalist for *Hinode Sports* with nocturnal missions as a masked enforcer. His adversaries range from the Space Wrestlers, a clandestine organization manipulating wrestling circuits, to rogue agents like Outer Space Mask, whose chaotic schemes threaten both the sport and public safety.

Trained in the original Tiger Mask’s combat legacy, Tatsuo wields techniques like the Tiger Finish, Avalanche Hell, Double Hammer, and Rampaging Drum, deploying them equally in sanctioned matches and covert battles against crime syndicates. While his ties to the Tiger’s Den—a shadowy group that groomed wrestlers for villainy in prior eras—remain undefined, his crusade systematically dismantles their residual networks to shield the innocent.

Later continuities, including the *Tiger Mask W* anime, place his arc in an alternate timeline, omitting his 1981–1982 storyline to revisit the original narrative. Tatsuo’s journey remains rooted in honoring Naoto’s principles while forging his own path against evolving threats, intertwining real-world wrestling personas with fictionalized foes.