Beat-Up But Shining

With Genos' frame corroding under the Sea King's acidic saliva, the monster seizes him, batters him against the shelter wall, and drives him out into the rain with a heavy blow. The creature admits its astonishment that the cyborg would throw his own life away to protect a little girl. As it moves to land the killing strike, Mumen Rider comes flying in from behind with his Justice Crash, literally chucking his bicycle at the invader.

Genos tries to wave the C-Class rider off, but Mumen Rider presses his attack anyway, only to be swatted aside, driven into the ground several times, and flung away. When the Sea King turns back to finish Genos, the rider latches onto it from behind once more. He confesses that no one understands better than he does how hopeless his odds are, yet he insists that the odds are beside the point, because someone has to stand and fight and no one else will. The onlookers begin to cheer, and though he rallies for a moment, a single punch to the face knocks him cold. Saitama arrives out of nowhere, catching the rider before he hits the pavement, praising his courage, and laying him down gently. Spotting Genos still clinging to life despite his melted state, Saitama tells him to hold on a little longer while he deals with the sea freak. The Sea King, now in its true form, snarls that it can hear him and slams a fist into the back of his skull, but Saitama does not so much as flinch.

The Deep Sea King punches the dissolving Genos out into the rain and prepares to finish him. Mumen Rider intervenes with his Justice Crash, is thoroughly beaten, and grabs the monster from behind while declaring he must fight even without a chance to win. A single blow knocks him out, and Saitama appears in time to catch him. Saitama vows to handle the Sea King and shrugs off a full-force strike to the head from the monster's true form.

This twenty-seventh chapter carries the Sea Monster Arc into its climax and was collected in Volume 5. Its release was split, appearing partially on August 3, 2013, before the full version arrived on August 29, 2013. The chapter is adapted in Episode 9 of the anime.