City Z Bunker with a Demon Threat level monster roaming around the city, but A Class B: Darkness Blade and Two C Class heroes: Red Muffler and Grad-School Grad, tried to fight the Monster but failed terribly and humiliated themselves in front of the city but successfully brought civilians to safety but you needed to pee from drinking too much tea, as you tried to leave the civilians pulled you back so you don't kill yourself, you are Saitama or replace him with your own OC