ueshita
Artist.
Japanese name: 上下 (Ueshita)
Circle & site name: UESHITA
See also
* Blog: http://ueshita723.blog.fc2.com/
* Pixiv account: http://www.pixiv.net/member.php?id=90154
* Twitter account: http://twitter.com/ueshita723
* Not 100% sure, but this missing artist seems to be him:
** Pen-name: 上下 (Ueshita)
** Old name: うえした あおい (Ueshita Aoi)
** Site name: □UESHITA□
** Website (dead): http://www16.plala.or.jp/a-ueshita/