something like I am Hero manga. or The Earth is Online. where the world is on the verge of collapsing or humans are decreasing in number. it would be better if the characters experienced the change of their lives and the story is about surviving the tragedy just like Earth is Online. but i'm also ok with post apocalyptic ones.
God and Devil World Warning: rape, s*x slave, prostitution, cannibalism... Things that I think will happen in an apocalypse. Autor has no filter
I Have a Mansion in the Post-apocalyptic World Love how he gets futuristic technologies from the future (apocalypse) and brings it back to the present to create an economic empire. And with those funds he develops the apocalypse
I’m currently halfway reading “I’m not shouldering this blame”: https://www.novelupdates.com/series/im-not-shouldering-this-blame/ It kinds of remind me of Earth Online. Maybe you can give it a try.
i'm uncomfortable reading yaoi or BL's... although i read Earth is Online but only for the games. still have to check it out. thanks..
Dungeon Battle Royale - Postapocalyptic. Not so much on the tragedy side as you might be looking for, but still fits your search.
Ah. I’ve not read too far yet. The BL is not too emphasised for now. Just pure liking one another which is cute and innocent. No touchy touchy for now.