Responses
He'll regress many many more times. :^)
Can you spoil me
Sure, though I'm not up to date with this story as of now.
In my opinion, some of the more interesting spoilers are - the world he's currently in is a corpse. That corpse is so terrifying, that the strongest beings in the universe try not to go too close to it (even the concept of fate tries to avoid it, somewhat). And also thinking about inverted cones turns you into a salt pillar.
I like how he doesn't just stop at 1 regression. Most Mangas have the word regression in the title like its some big thing but doesn't mean anything after the first chapter like in this one they talk more about it