Episode 21, One-Punch Man Wiki

quot;The Troubles of the Strongest" is the twenty first episode of the One-Punch Man anime series and ninth episode of season two. Bakuzan recognizes Saitama as the one who defeated him, but Saitama kills Bakuzan in one punch. Saitama formally introduces himself to Suiryu as a hero and explains that he joined the martial arts tournament to find the hero hunter as well as experience martial arts. Saitama plans to leave but Suiryu begs Saitama not to because Gouketsu is out there. Saitama ignores him

Episode 21, One-Punch Man Wiki

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