Reki Kyan, a high school student, is obsessed with skateboarding. When it becomes dark, he goes to "S," an illegal underground race within a mine where skaters compete in extremely risky scenarios. Reki is now unable to practice due to a loss that resulted in the destruction of his skateboard and the breaking of his arm. While at work, Reki meets his new classmate Langa Hasegawa, a half-Canadian, half-Japanese lad with no skating experience. Langa is eager for money. When they are both instructed by Reki's employer to see "S," they fall into problems and are forced into a bet that demands Langa to skate in a race. The unknown transfer student, on the other hand, has a trump card that Reki is not aware of.