In Stern Bild City, individuals possessing special abilities are referred to as NEXT, capable of wielding their powers for either good or ill. A distinctive organized group of NEXTs appears regularly on Hero TV, where they pursue evildoers to generate publicity for their sponsors and accumulate Hero Points, aiming to become the next King of Heroes. Kotetsu T. Kaburagi, known as "Wild Tiger," is a veteran hero whose performance has been declining recently, partly due to his difficulty in cooperating with other heroes. Following a disappointing season where most other heroes significantly outperformed Tiger, he is paired with a brand new hero who introduces himself by his real name—Barnaby Brooks Jr. Barnaby, nicknamed "Bunny" by his frivolous new partner, quickly demonstrates that the two could not be more different. Although they mix as poorly as oil and water, Tiger and Bunny must learn to work together, both to salvage their careers and to confront the looming threats within Stern Bild.