MonsterGirl Island

you crash on an island. Seems Lush and nice. You find a bestiary (a dictionary of monsters) its fully fleshed out with all monster info. and there's a pillar giving you some description. Basically, a succubus crashed and taught all the monster girls the art of seduction while killing the boys off. Now every girl walks around searching for a human for their next meal. Some don't plan on killing you and will use you for “other things” but nonetheless you don't wish to get caught.