mars~'s activites

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.

The main character was an actress for stage plays, and typically played the role of villain. Her 'rival' had blond hair (though I'm not too sure about that) and was popular, typically starring as the heroine. I don't remember if it was GL or not, and there might have been a psychological tag. I think the gist of the story was about the relationship of the two girls, though I don't remember if they were competing or cooperating.

School setting, yaoi/shounen ai, last I checked (a while ago) there were only a few (<10) chapters.
The protagonist was poor, and bullied/shunned at school. The 'male lead' was a rich transfer student.
There was one scene where the protagonist got in trouble because the male lead accidentally exposed that the shoes the protagonist sold/gave a bully were dupes and not the real luxury good.

Set in around the Taisho era, the protagonist was dismembered at some point so he is currently in the form of several body parts (I remember a hand, and maybe they find an eyeball at some point) in a jar. He made golems(?) with his friend, and one of the golems he made, a young girl, is helping him find all of his organs and limbs. Some past disagreement between the man and his friend lead to his dismemberment.

I don't think it was romance, wasn't school life, and (not sure, but I think) not psychological.

Please any leads would help. I've been looking for a while, but it's so vague in my memory that it's hard to find on sites such as Mangaupdates.

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Set in around the Taisho era, the protagonist was dismembered at some point so he is currently in the form of several body parts (I remember a hand, and maybe they find an eyeball at some point) in a jar. He made golems(?) with his friend, and one of the golems he made, a young girl, is helping him find all of his organs and limbs. Some past disagr......

“I didn’t follow you, you came next to me.”Ian Gloucester, a paladin of the religi...