Saitama became too strong. Yes, he did the 100 training regime, but he didn't stop there. He went beyond that, and did 200! Yes, he doubled his training! And he still kept going!
200, 300, 400.. All the way to 1000. At this point, he destroys everything in his path, just by eye movement.
If he took a small breath, he would take 30% of the earth's air. If he moved his head slightly, everything around him would be reduced to dust. If he took a step, huge earthquakes would happen around the world.
Every minor thing he did would destroy everything around him. So, he stopped moving. Completely. His willed his body to go into hibernation, but on a much bigger scale. See, normal hibernation for mammals would just have their heart rate slow, their breath low, and their metabolism reduce. What Saitama did was stop everything. His body was basically dead. His organs shut down. He did not breathe. He was completely still, like a statue.
He went into deep meditation as a statue, to pass the time. He also didn't want to see all the sales he missed whilst in meditation. For centuries he meditated, slowly reaching enlightenment without even knowing it.
In the outside world, he was one of the 7, now 8 wonders of the world. A completely unmoving man, with all his needed organs shut down. But he was still alive. Countless doctors, scientists, heroes, tried to get the secrets of his body. But when they tried moving him, they couldn't. It was like he was glued to the earth. They tried cutting him, to get samples, but all weaponry broke before him. It didn't help that he was bald. Both atop his head, and down there. They tried everything, but nothing worked. So they gave up.
The Earth slowly changed without Saitama. Humans nearing extinction many many times. The Hero Association barely got the human population to an acceptable level. Hell, the only reason the Hero Association existed was because the CEO's son died from a Mysterious Being. Many great heroes died as well. Silver Fang died from natural causes at age 167. Watchdog Man died from heart worms. Etc.
At the same time, many other heroes with potential that passes their predecessors appeared. Some monsters even jumped to the hero's side. All without Saitama knowing.
Now that 300 years have past, Saitama awoke from his hibernation. He had reached enlightenment, meaning he also gained control of his emotions, and strength. For the first time in hundreds of years, Saitama could finally get the sales he desired.
Oooie, another story after like, 5 months. I probably won't finish this, like my 2 other stories. But meh.
So Saitama got too strong, and a lot of other shit happened. I'm gonna have to make tons of OC's to replace the roster of the fallen heroes. Also new enemies for Saitama.