I read rebirth stories and stuff in BL but I think this is the first time with a regressor. A fresh change , it is good. I also love surviving stories so perfect trio! Survival, a regressor and BL.
Then you should read Dreadful Night, if you haven't!
I'll leave the link.
https://www.mangago.me/read-manga/dreadful_night/
Big hands holding the slim waist...I died.