@CrazyPotato , eh? so is this really a time travel story? what do you mean by force reset? it looks like that he's simply crossing between world that has time dilation with his physical body minus his power that was sacrificed when he passed dimensional passage instead of simply jumping back in time.
I feel that panzer590 explanation was more understandable... or I am misunderstanding things
..I actually went back to Ch.1 and nothing makes sense... first page he said "it has been 30 years".. 30 years on what?
and then when he opened the dimensional crack "this is my memories from 3k years ago".
then he actually had no idea what the heck happened when he came back to his old world,... assuming it has been 3k years and he did a reset... he should at least have some sort of foresight for events..he didn't even know that his sister was kidnapped by big sect...