Since It's Raining

Saitama plants himself between the knocked-out Mumen Rider and the Deep Sea King while the sheltered crowd watches, uneasy that a mere C-Class hero could accomplish anything. The monster announces itself as the sovereign of the sea and the being that sits atop the pyramid of all life. Saitama waves off the grandstanding and simply tells it to get on with things. Enraged, the Sea King swings, Saitama answers with a single punch, and the blow bores a hole clean through the creature's body. As the monster drops, the onlookers erupt in stunned disbelief.

The mood sours when one bitter evacuee starts stirring up doubt, insisting the monster could not have been so tough and that the earlier heroes must have already worn it down before Saitama showed up. He piles on, dismissing the injured fighters as feeble and pointless. Hearing this, Saitama begins to laugh and loudly agrees, claiming he got lucky that the others softened the beast up so he could swoop in and grab the glory. He tells the crowd they had better spread the word that he beat it and warns them not to snitch on his little scheme. The trick works in reverse, and the citizens redirect their thanks to the battered heroes rather than to him. Genos, troubled by what this means for Saitama's standing, vows to stand beside him whenever he is cornered. Elsewhere, Sonic returns fully armed to fight the Sea King, unaware it is already dead, and in G-City the great oracle Shibabawa foretells a disaster greater than any in the era, declaring that the Earth itself is in peril.

The Deep Sea King proclaims itself ruler of the sea, and Saitama destroys it with one punch through the torso. A heckling evacuee belittles the wounded heroes, so Saitama deliberately takes the blame for stealing their credit, steering the crowd's gratitude back to them. Genos pledges to support Saitama. Sonic returns armed but too late, and in G-City the oracle Shibabawa prophesies a catastrophe that threatens the entire planet.

Closing out the Deep Sea King confrontation, this twenty-eighth chapter belongs to the Sea Monster Arc and was printed in Volume 5. It released on August 29, 2013, and is adapted in Episode 9. Shibabawa's ominous forecast at the end seeds the threat that drives the following arc.