sakimori_(hououbds)
Artist.
Japanese name: 防人 (Sakimori) (reading is a best guess)
See also
* Pixiv account: http://www.pixiv.net/member.php?id=211515
* Piapro account: http://piapro.jp/hououbdps
* Drawr account (unconfirmed): http://drawr.net/hououbds