Nazarick Rimuru

Having never seen the original OVERLORD, he passed through this anti-social utopian world.
Become a peeing flying rat, and at the same time stay in the game based on your favorite past life Rimuru model the creator of the slime game character.
When he and the rat flew together in the game, he went through the different world by himself.
Looking to the time mouse flies, time has passed a hundred years.
This was the incident where Rimuru and his rat companions flew to the same place in the strange world of adventure.