Jun Kinoshita (Tetsuya Deguchi), a rookie wrestler at the struggling professional wrestling organization "Aiiku Pro Wrestling," run by Ken Aida (Tatsuya Gashuin), encounters a burly vagrant who rescues the president's daughter, Eri Aida (Kayoko Shibata), from a gang of delinquents. That man, Sanshiro Matsudo (Nicholas Pettas), was once a superstar in the martial arts world! However, he has now been transformed into the weakest wrestler at the underground wrestling training facility "Sai no Ana." Inspired by Jun's passion for martial arts and his interactions with Eri and the wrestlers of "Aiiku Pro Wrestling," Sanshiro decides to return to the ring. Meanwhile, "Sai no Ana's" notorious wrestling team, "The Jasons," throws down the gauntlet to Aiiku Pro Wrestling. On the day of the decisive battle, after grueling training centered around Sanshiro, something happens to Sanshiro...