Two young wrestlers face each other in a recently revived underground wrestling organization, the Tiger's Lair, which destroyed the wrestling dojo they grew up in. One took over the training facilities of Naoto Date at the foot of Mount Fuji, as well as the mask he left behind. The other dared to enter the Tiger's Lair and won a fierce competition, receiving a jet-black tiger mask. One tiger walks the path of light, while the other walks the path of shadows. Neither one knows the other's face. On the ring, they are natural enemies, but they have the same purpose—destroy the Tiger's Lair! (Source: MAL News)

Tiger Mask (whose real name was Naoto Date) was a feared heel wrestler in America who was extremely vicious in the ring. However, he became a face after returning to Japan when a young boy said that he wanted to be a villain like Tiger Mask when he grew up. The boy resided in an orphanage, the same one that Tiger Mask grew up in during his childhood. Feeling that he did not want the boy to idolize a villain, Tiger was inspired to be a heroic wrestler. The main antagonist in the manga and anime was Tigers' Den, a mysterious organization that trained young people to be villainous heel wrestlers on the condition that they gave half of their earnings to the organization. Tiger Mask was once a member of Tigers' Den under the name Yellow Devil, but no longer wanted anything to do with them, instead donating his money to the orphanage. This infuriated the leader of the organization and he sent numerous assassins, including other professional wrestlers, to punish him. (Source: Wikipedia)

In Stern Bild City, those with special abilities are called NEXT, and can use their powers for good or bad. A unique organized group of NEXT appear regularly on Hero TV, where they chase down evildoers to bring limelight to their sponsors and earn Hero Points in the hopes of becoming the next King of Heroes. Kotetsu T. Kaburagi, known as Wild Tiger, is a veteran hero whose performance has been dwindling as of late, partially due to his inability to cooperate with other heroes. After a disappointing season in which most of the other heroes far outperformed Tiger, he is paired up with a brand new hero who identifies himself by his real name—Barnaby Brooks Jr. Barnaby, nicknamed Bunny by his frivolous new partner, quickly makes it clear that the two could not be more different. Though they mix as well as oil and water, Tiger and Bunny must learn to work together, both for the sake of their careers and to face the looming threats within Stern Bild.

Tokio is a junior high student living in the present time who is recruited to be a member of the 24th century's Space-Time Administration Bureau. Together with his partner Calen, their mission is to uncover the True History, the part of history that the textbooks doesn't tell. But in their way is the Akudama Trio that intends to prevent the True History from being revealed for their own personal gains. (Source: Wikipedia)