The legendary grade world where Roger went to was called "BANKAI". It was a mechanical world where sentient Artificial Intelligence and Rich Overlords were in constant fighting.
This kind of world was perfect for an outlaw and bandit like Roger. There were a lot of common people in this world who supported neither the Artificial Intelligent beings or the Rich Overlords and they wanted to overthrow both.
Roger became the leader of this group of people and started to led them in order to resist against the tyranny of both of the ruling sides.
Roger had came to this world in order to continue his journey of Strengthening by adding various mechanical components to his body. But in this world, he would encounter something different that would completely change his life.
