Stinger vs. Seafolk

Stinger vs. Seafolk was the battle between the A-Class hero Stinger and the Seafolk.

Prologue
An octopus-like Seafolk appears on the surface of the Earth, claiming their kind will take over the surface before it is killed by Saitama. Later, its fellow Seafolk appear from the ocean and cause havoc in J-City. One of the monsters grabbed a citizen with its tentacle, threatening all that stand in its way. However, the monster's tentacle was cut by A-Class Rank 11 hero Stinger, and he saves the citizen. The hero introduces himself to the crowd of fans and monsters as he challenges them to a fight.

Battle
The scene later fast forwards to a wounded Stinger facing down four Seafolk after killing six of them. He is shown to have blood running down his face and a large bruise as well, breathing heavily while facing the remaining Sea Folk. Stinger admits to the monsters that they have spunk, yet calls them slimy bastards. He goes on by saying his bamboo shoot is stoked to battle enemies with some power for a change, yet he claims that it is time to end this. One of the sea folk tells the hero to quit his boasting, remarking that his ridiculous fan club already left. Another sea folk assures Stinger that his death will be painful, and for the deaths of their brothers, he will suffer. However, Stinger isn't dettered and actually states that not having an audience around makes it easy for him. One of the sea folk attacks Stinger with his tentacle, but Stinger unleashes his technique Gigantic Drill Stinger, followed by Quadruple Thrust, to kill the final Seafolk and claims victory.

Aftermath
While Stinger celebrates his victory, thinking he stopped a God-level threat, the Deep Sea King appears and defeats him in one punch, although this was while he was significantly injured and off-guard. At some point after his defeat, he was ascended to A-Class Rank 10.