A World Beside Ours

It is the year 2420 and the virtual reality technology has advanced by leaps and bound. The first big jump in the vr tech happened in 2403 when Rosette Avison made a huge discovery. She found a new way to connect a human brain with a computer. This way it was possible to simulate the senses of humans up to 40%.
After her the next genius is our protagonist, who at the age of 13 created a game with 95% life like NPC's. However, sadly his life was short lived.
But to his surprise, he reincarnates 100 years to the past. What he plans to do is to make a game so realistic that you cannot distinguish it from reality.
But when he was almost done with his game, he finds out that the world he had thought to only be a game, had surprisingly become a real world. With it the 90% realistic NPC's became 100% realistic. Everything became 100% realistic.
The only thing left to do, is to release the game to the public.
'This will be the greatest game EVER!'