Fed up with society, youngsters all around Neo-Tokyo formed tribes to find their place in the world. However, group loyalty among them grew fierce and often led to violence. As a countermeasure, the government implemented the XB Law—stating that the tribe conflict is to be resolved through Extreme Baseball. From players using extendable bats to pitchers wearing special equipment, Extreme Baseball is a futuristic version of the sport with modified rules, less restrictions, and bizarre applications of technology.
When a group of youngsters bullies spineless Haru Shirokane, he is saved by an unexpected pair: Shun Kamiya and Taiga. As it turns out, Shun is a star player of Extreme Baseball who leads the Minato Tribe, the top-ranked team in Minato City. Meanwhile, Taiga aims to defeat Shun in hopes of becoming the strongest in the sport. In a string of spontaneous events that allow Shun to discover their potential, Taiga and Haru are roped into joining the Minato Tribe.
As the tribes across Minato City face a new threat led by the mysterious Oujirou Otori, the Minato Tribe might just need the power of their two new rookies to overcome the clutches of evil.
- Other Title: Tribe Nine, TRIBE NINE（トライブナイン）
- Status: Completed
- Sub/Dub: Anime Dub
- Anime Type: TV
- Genres: Sports, Sci-Fi, Team Sports, Action, Game, Mecha, Animation, Sci-Fi & Fantasy, Based On Video Game, Anime
- Characters: Arisugawa, Saori, Daimon, Manami, Kamiya, Shun, Mita, Santarou, Shirokane, Haru, Taiga, Aoyama, Kazuki
- Score: 6.07
- Rank: 9107
- Popularity: 3166