An enormous meteor hurtles toward City Z, forcing the Hero Association to ask its S Class heroes to respond. When all their efforts prove in vain, Genos decides it's up to him to protect the home of his master and stop the meteor, no matter what the cost.

The Deep Sea King has defeated every hero who opposed him with ease. Genos is preparing to attack while Licenseless-Rider and Saitama rush to the evacuation shelter, where the battle continues.