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Nill is a genetically modified girl with tiny angel wings. She is mute and currently resides at Bishop's church.
Not much is known about Nill aside from the fact that she was working as a child prostitute when Haine was acting on a tip from Badou about a gang that was using genetically-modified girls as underage slaves. After freeing most of the slaves, Nill found herself drawn to Haine, but Haine didn't really want the companionship from her. However, when Nill's pimp took her back by force, Haine and Badou went back to bust her out.
Currently, Nill resides as an assistant to a blind priest in a church who might be a lolicon. However, it's an improvement over her past situation as Haine seems to develop some feelings for her.