Having apparently trained himself so hard that he unintentionally gained strength that goes beyond superhuman level, Saitama faces an existential crisis as he is now too powerful to gain any thrill from his heroics. He is registered with the Heroes Association as a B-Class Superhero (A-Class after Monster Association Arc) and is tasked to defend Z-City against mysterious beings. He is registered with the Heroes Association as a B-Class Superhero (A-Class after Monster Association Arc) and is tasked to defend Z-City against mysterious beings.