One Punch Man Manga Chapter 27

After a laugh, Genos is nearly killed by the Deep Sea King’s acid, being thrown through a wall. Determined, Genos decides to sacrifice himself to stop the Sea King, impressing the monster and prompting him to prepare for a final attack. Mumen Rider desperately tries to intervene on his bicycle but is in danger.

Genos, despite his injuries, attempts to stop Mumen Rider but is easily overwhelmed. A weak hero with rotten teeth briefly transforms into Mumen Rider, summoning courage to fight, yet he is quickly defeated.

Just in time, Saitama arrives, saving Mumen Rider and applauding his bravery. He notices Genos has survived and turns his attention to the newly transformed Sea King, who charges at him—but Saitama remains completely unbothered, not even flinching.