I think the reason saitama is not showing up yet is because the “main boss” has not shown up yet. These villains can still be defeated by the class S heroes without saitama’s assistance.
Saitama already killed the main boss tho, monster king or something like that Captive Osprey
I don't think that monster was the main boss since the giant girl that tatsumaki fought was said to be stronger. The author might be planning to add a stronger villain in my opinion
Half of these comments are just thirsty over yoshino I AGREE SHE CAN RUN ME OVER WITH HER VAN AND I’D SAY THANK YOU