In Okinawa, a group of hardcore skaters participate in a secret, no-holds-barred competition after midnight known as "S," racing each other on skateboards down a winding road carved out of an abandoned mine and occasionally forming "beefs" (rivalries) with each other. Reki, a high school sophomore and hardcore skater, takes new transfer student Langa to S one night, and ends up pulling him into the world of skateboarding.