The anime centers on Reki, a second-year high school student who loves skateboarding, and gets caught up in "S," an underground and dangerous skateboard race at an abandoned mine with no rules. Ranga, who has returned to Japan from Canada and has never skateboarded before, also gets wrapped up in S along with Reki. Dirty racers, AI racers, and other unique individuals compete in the "youth skateboard race battle.
