Zummy's circle. He has another pixiv account and webpage for his circle.

Circle name: うさねり★アイランド (USANERI IsLand)

See also

• Zummy
• Circle home page: http://usaneri.dojin.com/
• Circle blog: http://usaneri.b.dlsite.net/
• Pixiv account: http://www.pixiv.net/member.php?id=2254030
• Digital distribution site(JP): DLsite.com