ok as of right now ive come up with a theory, as of right now in japan there are 6 vols and there seems to be some kind of hint or maybe even told straight out that nagi is not pure(if you get what i mean and if you don't figure it out) and it has caused an up roar in the otaku in japan and this has been intensified by the author getting sick and stopped writing. i thought about it and came to the conclusion that she has been around for long time and so it is plausible that she had a lover, i mean look at it right now. with that aside, she tells tsungumi straight out that she has some she likes and is not jin, ok here is were my theory kicks in jin has a father who is some where on earth and no mother to speak of, i thought about and came up with that nagi is jin's mother and we have some evidence of it might be true cause he can catch the impurities with no training to speak of, you also see her as grown women when jin is little and seems to have that motherly aura around her so it is possible. oh yah one last thing about the otaku in japan apparently one of them ripped the 6 vols up and took a picture of it and and put it up on the web to vent his anger about nagi being being impure, that's some crazy shit