Watch One-punch Man - 09 Apr 2026

Due to his actions, Saitama is promoted to B-Class (Rank 101).

Knowing he is completely outmatched by the Sea King, Mumen Rider fights with pure conviction to protect the people, earning the crowd's cheers and the respect of the battered heroes.

He delivers a powerful monologue, acknowledging that while he knows he cannot defeat the monster, his duty as a hero is to stand and fight regardless. He is mercilessly beaten, nearly to death, but refuses to back down. 3. Saitama’s Intervention Watch One-Punch Man - 09

Later, Saitama and Mumen Rider share a meal at an oden stand, where Mumen Rider thanks him, cementing their bond.

While other heroes were defeated and the public was in despair, Mumen Rider's bravery inspired the crowd. Due to his actions, Saitama is promoted to

Following the fight, Saitama overhears a civilian mocking the heroes who lost, suggesting they were weak. Saitama takes the blame and plays the fool, acting as if he only arrived after the other heroes "weakened" the Sea King, to protect the pride of the fallen heroes.

Season 1, Episode 9 of One-Punch Man , titled (or "Unbending Justice"), is widely considered a pivotal, emotional high point of the series. It concludes the intense Deep Sea King arc, shifting from the flashy action of S-Class heroes to a profound look at what defines a true hero. 1. Genos’s Sacrifice He is mercilessly beaten, nearly to death, but

Just as the Deep Sea King is about to destroy Mumen Rider , Saitama arrives. In a single, calm punch, Saitama obliterates the Sea King, stopping the rain and ending the threat instantly. 4. The Aftermath: Justice vs. Popularity