nagato_tamakichi
Artist.
Japanese name: 長門 珠吉 (Nagato Tamakichi) (Reading is a best guess)
See also
* Pixiv account: http://www.pixiv.net/member.php?id=1717695
* Nico Nico Douga account: http://www.nicovideo.jp/user/14819373
* Nico Nico Seiga images: http://seiga.nicovideo.jp/user/illust/14819373
* Twitter account: http://twitter.com/iveraptor