Disillusioned with society, youths across Neo-Tokyo formed tribes to carve out their place in the world. However, loyalty within these groups became intense and frequently resulted in violence. In response, the government enacted the XB Law, which mandates that tribal conflicts be settled through Extreme Baseball. Featuring players with extendable bats and pitchers equipped with specialized gear, Extreme Baseball is a futuristic iteration of the sport characterized by altered rules, fewer restrictions, and unusual technological applications. When a group of youths bullies the timid Haru Shirokane, he is rescued by an unlikely duo: Shun Kamiya and Taiga. Shun turns out to be a star Extreme Baseball player who leads the Minato Tribe, the highest-ranked team in Minato City. Meanwhile, Taiga seeks to defeat Shun in order to become the strongest in the sport. Through a series of spontaneous events that enable Shun to recognize their potential, Taiga and Haru are drawn into joining the Minato Tribe. As the tribes throughout Minato City confront a new threat led by the enigmatic Oujirou Otori, the Minato Tribe may require the strength of its two new rookies to overcome the grip of evil.