A hotheaded youth in 1880s Meiji Japan apprentices to judo master Shōgorō Yano, trading brute jujutsu bravado for discipline and humility. As Sanshirō matures, he proves judo’s spirit against old-guard challengers—including a deadly duel—while falling for his vanquished opponent’s daughter.

A few years after his breakthrough, Sanshiro resumes his path to judo mastery—testing his discipline against an American prizefighter and later facing vengeful karate brothers. As rival schools and public spectacle push him toward violence, he must reconcile strength with restraint and the true spirit of his art.