any1 know yaoi where it's like "oh no world's gonna end" or like "it have been 200 years since 99% of human population have died" or "this alien dieases is killing every females on earth"

or maybe even a cast-away yaoi, where two men ends up in deseted island?

or something along that line?

West End

Madness

Hanakisou

X

Marginal

Silver Diamond

Oriolidae & Sparviero

happy ending
even though the ending is quite sad

Recommend me horror , yaoi and shoujo manga please 😀

Lamento (BL game)
there's the english scanlation of the manga 😎

My daily websites:
batoto.net, tvtropes.org, 9gag.com

No. 6 kinda fits. It's not outright BL, but it is definitely a manga that would appeal to BL fans due to the subtext. The dystopia type future comes in after a handful of chapters, so don't be fooled by the utopia plot that it starts with.