Nan

On the brink of death, the strongest warrior of humanity, Ang, mysteriously reincarnates sixty years into the future with the strength of the "Strongest Demon" a dangerous double-edged sword. In order to resolve his regrets and unveil the truth, Ang

Guy's whole class gets summoned to another word, except he's the only who one was transferred to a different one. Just when he gets used to his new life, he gets summoned to another world again, and again.