It was the first manga I read and wasn't too into it at the time so I don't really remember character names or the manga name or even really how it went. I vaguely remember how it went I just wish to reread it. Ok so this is what I can remember. This might be wrong but they take students and force them to participate in a game. This game is located I could be wrong but on an island maybe. It's definitely isolated. The game is pretty much kill or be killed. The last person Alive wins their freedom?? Maybe idk something like that. I believe that even if you win you are just forced to play again. Till well you die. And apparently their is a 3x vet who ends up helping a couple beat the game. Said couple ends up making to the us and escape. They also take down the boss in the process?? Sorry this is most i can remember and would very much like to reread it. If anyone know please post will pay like 50 fg if you know thanks. Also it has a lot of gore if I remember correctly dunno if that helps or not.

Tl;dr

Looking for a manga only information I have is that students are forced to play a game and said game is kill or be killed. In the end a 3x game vet helps a couple take down the boss and escape to the us or something like that.

sounds like battle royale

Cool beans man Ty

/thread

Afterwards try Kamisama No Iutoori
It's similar to battle royale but yeah