No, not really, otherwise it would be posted by now. The only chance I coukd have missed invisibility would be if it did involve a ghost, it's unlikely that I paid attention if they were invisible to the characters around them.
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[Okamoto Kazuhiro(岡本一広)] Translucent (トランスルーセント) - Vol.01~05 [2005~2006]
As the title suggests, the girl is translucent, though she also turns completely invisible, it happens really suddenly in Vol.04 but the girl reverts back before the volume ends, in Vol.05 she unconsciously turns invisible, suggesting her emotions may have something to do with it.
Again, I have to thank dragonicman for submitting the info about the series.
http://rapidshare.com/files/85239479...6-30_.zip.html [v01]
http://www.mediafire.com/?0hzynvtvtjm [v02]
http://rapidshare.com/files/85297639...2-31_.zip.html [v03]
http://rapidshare.com/files/85297640...6-30_.zip.html [v04]
http://rapidshare.com/files/85304289...1-30_.zip.html [v05]