Looking for some anime /manga

Looking for some Survival horror like manga/anime right now, I like them with some romance in them, but not comedic. Something like Mahou Shojou of the End, Battle Royale, or Gantz. I also like the whole stranded on some deserted island or place like in Btooom! or Battle Royale, more into it when the characters fight among themselves, not when they all try and band together to fight off a common enemy. Definitely willing to try new things but thats what im gonna start with.

Perhaps Akuma no Riddle if you're interested in characters fighting against each other, and I suppose it could also count as survival. I'd also say Highschool of the Dead, but it's fairly popular so you might have already seen it.

Thanks, Akuma no Riddle looks pretty interesting so ill probably check that out pretty soon, and yeah Ive seen Highschool of the Dead.

Robotech is a little old and probably not what you're looking for, but It does fit the bill.