Artist.

Artist name: 77gl (pronounced as "Nanaho")
Circle name: 七穂電子 ("Nanaho Denko") (Not "Nanaho Denshi")

See also

• Pixiv account: http://www.pixiv.net/member.php?id=480448
• Twitter account: http://twitter.com/77gl
• Twitpic account: http://twitpic.com/photos/77gl