Devil's Bizarre Adventures in the Multiverse

The origin of the story lies in a remote and desolate dimension. He is the strongest being in the clan. He has lived for millions of years, but he understands nothing and has no concept of time. He wanders aimlessly every day, but he has more self-awareness than other people in the clan. By chance, a fool who called himself the ultimate creature opened a portal to the vast universe for him, and thus began his long journey of understanding the world.