I'm looking for a manga(?). It should be pretty old, I think it was a survival game theme where the protagonist woke up with no memories (she had green-blue(?) hair) and was forced to kill. It was later revealed that she was originally one of the researchers who volunteered to undergo the experiment.
I think the name was something like black swamp/marsh, but I can't find anything about it.
I'm looking for a manga(?). It should be pretty old, I think it was a survival game theme where the protagonist woke up with no memories (she had green-blue(?) hair) and was forced to kill. It was later revealed that she was originally one of the researchers who volunteered to undergo the experiment.
I think the name was something like black swamp/marsh, but I can't find anything about it.
And it might have been based on a videogame.