Mystery

When a plane crashes on a mysterious island, it's victims have to start surviving dinosaurs, mosnters, and disease to stay alive. The big question is what is the island? And why are there dinosaurs? But most importantly can they survive? A lot of deaths, but I have some problems with it like
*Spoiler*



How come none of the girls die? If I remember correctly. Was it just to keep for fan service?

Classroom filled with unstable students, but with a mastermind behind all tragedies. Unfortunately this doesn't seem like it'll be updated and is incomplete, but the chapters so far are very interesting.