Naoto the previous main character of Tiger Mask died while saving a child. The story begins with a new opponent called Outer Space Mask who bullies his way into the ring without representing any wrestling federation. Tatsuo Aku, once an orphan child from the house of the children, was a fan of Naoto. He would put on his old hero's mask to become the new Tiger Mask.

Source: Wiki

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Prequel: Tiger Mask
Same setting: Tiger Mask W