A mysterious and feared masked wrestler named Tiger Mask, who has already made headlines throughout the Americas for his notorious dishonesty, returns to Japan. Regarded with disfavor by the entire Japan Pro-Wrestling Association, he is immediately ostracized; the only one who seems to understand him, despite everything, is Giant Baba, a respected and extremely honest pro-wrestler. Kenta, a boy living in the Chibikko House orphanage, despite everything and everyone, shows—uniquely among the children—a tremendous admiration for Tiger Mask. The two young people who currently run this shelter for abandoned children are also former orphans, a brother and sister: Kenta reminds him strongly of their old friend Naoto Date at his age, who ran away over ten years earlier and never returned, when after a visit to the zoo, standing in front of the tiger's cage, he resolutely declared that he too wanted to one day become as strong as a tiger...

Little Kenta runs away from the orphanage to attend a match with Tiger Man, who is as ruthless as ever with his opponents.

Naoto returns to the orphanage where he grew up. While in the role of the Tiger Mask, he must face Monster, the man with the steel head.

Uomo Tigre reflects on his training at the Tiger's Den, which subjected him to cruel and nearly unbearable training.

Mister X threatens Tigre d'Acciaio because he wants him to give him half of the money he earns from the matches at the Tiger Cage.

At the airport, a tiger escapes, but Pitone Nero, the next opponent of the Tiger Mask, stops her by rendering her docile with his charisma.

After Ruriko asks Tiger Mask to fight fairly, he wins his first match without using illegal moves.

Ruriko begins to suspect that the Tiger Mask is actually Naoto, who, in the meantime, must evade the attacks of Mister X.

The gigantic Gorilla Man arrives in Japan, the next opponent of Tiger Mask sent by the Tiger Cage.

Uomo Tigre is training for his next match, but Baba makes it clear that his method is wrong.

Baba tries to convince Tiger Mask to participate in the next World Tournament, but he is hesitant.

Uomo Tigre fears that he will not be able to contain his unorthodox style for the World Tournament, but he will soon change his mind.

During the meeting with Stella di Teschio, Mister X causes a blackout in the arena to carry out another one of his evil plans.

Daimon, Naoto's training partner, sends a letter to his friend from the Tiger's Den. However, Mister X gets ahold of it and uses it to blackmail him.

Caught up in the excitement of cheering, Kenta breaks the orphanage's television, leaving the children unable to watch the next Tiger Mask match.

Stella di Teschio refuses to kill Naoto and is killed by Tana delle Tigre instead. L'Uomo Ombra doesn't want the same thing to happen to him.

Cappy is hit by a hit-and-run driver. Naoto and Kenta set out to find her.

Mister X tries to force Daimon to fight Naoto, even using torture. In the end, the man gives in and decides to face his friend in the ring.

L'Uomo Tigre decides to help a boy he just met. Will he make it back in time for his match?

Naoto takes the orphans to the amusement park, but he is pursued by Tana delle Tigri there as well.

Brisco had been confined to a wheelchair by Tiger Man when he was still evil. Now his brother has arrived in Japan to seek revenge.

Tiger Man suffers an injury during a match and should rest, but his next match is too close.

Tana delle Tigri selects a group of masked wrestlers to send against Tiger Man.

Tigre decides to participate in the masked wrestlers' tournament to help the blind orphan girl. His first opponent is Mister No.

Tiger Man must face two other masked wrestlers in the tournament in quick succession. The two use completely illegal tricks.