John Atienza is a disabled boy that gets by a truck and sent into another world, he just so happens to be the protagonist of both books where he must compete in the scenarios over and over till he reaches the 100th scenario and ends the scenarios filled with death once and for all.
To get the furthest he possibly can in each scenario, he kills and kills like a ruthless murderer and makes allies along the way but he must watch them die many, many times which fills his heart with sadness and despair but despite all of that he completes the scenarios.
He was the weakest man in his region let alone in the world, he struggled all his life because he couldn't live up to societies standards and then he gets lucky and he finds a random skill book lying around and through that, he becomes the weakest on his way to the throne of the strongest in the world.