Ok, so the main story is about Saitama who is a hero for fun. He is insanely strong. Let alone anime, i think he is the strongest fictional character. Despite being this strong he says he trained for 3 years and done only pushups, sit ups and squats and he is this strong. TBH Saitama isn't even sure about the secret of his power. He is a man who is depressed because he finishes everyone in One Punch :3. XD
Then, he crossed path with a Cyborg named Genos. Genos saw Saitama's true power and became his disciple to become more and more stronger though he doesn't know whom he is roaming with (the strongest man alive)
Okay so basically i will say OPM is famous for Saitama and the actions scenes. The action scene of this anime is totally insane. Basically the last ep of S1. But i think this anime is lacking some places
Where it lacks: You will see ahead that saitama is too much strong and has defeated thousands of demons, enrolled into Hero association, still the public and all the people claim him as a credit taker or a cheater. This was too much painful to take. This was the main side where this anime lacks. There were other places. like Saitama is like emotionless. If any girl approaches i don't think he knows how to react (though the creator made him like this intentionally). Still, you can try MOB PSYCHO 100 made by the same author of one punch man. Mob psycho is far more better and has some intense fighting scenes. It has already become very popular around the world. Try it out!
SPOILERS AHEAD:
I think Saitama is the strongest fictional character. Some say Hulk, Superman, One Above all, every one can beat him. But i think it's useless. You know why? If Saitama can defeat the god of Dark matter, the dominator of universe (Borors) without giving any effort i don't think those guys stand any chance against him. That's all i wanted you to know . Thank You :)
