An impending God Level threat is arriving in 3 days and the Number 1 hero named Blast is recruiting the strongest warriors to fight against it. Blast stumbles upon Saitama, knowing his reputation as a one punch artist, he decides to test Saitama to see if that theory is true.
Saitama has heard about the number 1 hero named Blast as well through the Hero Association. Saitama is fired up and ready to show off his power against Blast so he can face this God Level threat which can potential prove to be a worth opponent.
Fanimation is by Animation Guru