A kid gets yanked into a world where mountain biking is literal survival, and the only way home runs through races that keep getting deadlier. Shou carries his friends' lives on every pedal stroke, which means every crash isn't just embarrassing, it's catastrophic. The show treats bikes like they're as dangerous as swords, and it commits to that premise harder than you'd expect from 2005 TV anime. This is for people who want adventure that doesn't need dragons or magic systems, just velocity and the person gripping the handlebars refusing to quit.
Shou lives for mountain biking, but a cocky challenge against a rival team goes sideways when he and his friends suddenly vanish from their world. They wake up in a strange realm where ancient gods oversee supernatural races called Idaten Battles. The catch: victory in these competitions might be the only way home. Separated from most of his crew, Shou discovers he's not just competing for himself. His friends are counting on him to win, to survive, to find the path back. Every race demands more than raw speed. He faces opponents with impossible abilities, environmental hazards that defy logic, and competitors who've trained their entire lives for this moment. What begins as a simple sports competition evolves into something far larger. Shou learns the world operates by rules he's still figuring out, and the stakes keep climbing. Each victory brings him closer to home but also reveals deeper mysteries about why he and his friends were chosen for this trial at all. Shou must dig deeper than he ever thought possible to transform from a cocky rider into someone worthy of leading his team back.