Artist.

Japanese name: 柚木 潤 (Yuzuki Jun) (reading is a best guess)
The other names: "ｓｐｑｒ" or "kinkonkankon"
Site name: ナトリウム日記

See also

• Homepage: http://natoriumu.tuzikaze.com/
• Pixiv account: http://www.pixiv.net/member.php?id=1195703
• Old pixiv account (empty): http://www.pixiv.net/member.php?id=267702