Saitama and Genos glean information about The House of Evolution and its founder Dr. Genus, a scientist with dangerous ideas on artificial human evolution. Meanwhile, Dr. Genus learns of Saitama’s amazing strength and has plans of his own for One-Punch Man.

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.

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During a coincidental train ride, Genos and Fubuki are put to the test when an anti-Hero Association group plants a bomb on the train.

Child Emperor investigates the murder of Zombieman. When Saitama is put under suspicion, Genos promises that he will vouch for Saitama even if he’s the culprit.