I think it was around v13, but I might be wrong. The whole series is here:
http://www.process-productions.com/f...ad.php?t=11813
As for Shizaki Masayuki, there were only a few mangas, I don't have time to look now, Masayuki made goddess jokes, but the rest is mostly lolicon, for some reason the author banished around 2006.
Everything seems to indicate inactivity, maybe making a non-hentai series ?