After arriving at the Nationals, Seishun scouts their upcoming opponents: their old rivals Rokkaku and an unknown team from Okinawa, Higa Junior High. After watching Higa mow through their first-round match-ups, the Seishun players are taken aback by the team's dominance. But there's no time for doubt—the second round is starting, and it's Ryoma versus Higa's heavy hitter, the giant Kei Tanishi and his unreturnable "Big Bang" serve.