The Strongest Man
Saitama is a guy who's a hero for fun. After saving a child from certain death, he decided to become a hero and trained hard for three years.
The Lone Cyborg
A monster is moving toward City Z, one that has been created by the mysterious organization known as The House of Evolution.
The Obsessive Scientist
Saitama and Genos glean information about The House of Evolution and its founder Dr. Genus, who learns of Saitama's amazing strength and has plans of his own for One-Punch Man.
The Ultimate Master
Though he's been doing the hero gig for three years, Saitama realizes that the public knows nothing about him. Determined to get a little recognition, he decides to become a pro hero.
As the battle with the Deep Sea King reaches its climax, more heroes fall to the aquatic despot's brutal attacks.
Saitama tags along to an emergency meeting of Class S heroes and discovers that a seer has foretold a serious danger threatening the Earth.