To put it simply, it is a story about a young boy who complains and travels to a new world.
To expand a bit, it is the story of a complaining boy who traveled through time and became a god in the new world and then became a new generation of poisonous Bailan.
"What... Atobe-san, why are you so upset with me? Huh? Isn't it because I didn't give you that strawberry-flavored Haagen-Dazs back then? Why are you showing such a constipated face?"
Well, actually he is still a slow guy.