Doujin circle that consists of two artists/illustrators.
Circle name: Circle画流 (サークル画流, Circle Garyuu)
Member 1: 天義 斬 (Amagi Zan)
Member 2: 零次郎 (usually written as 0-jirow, but the reading is given as おーじろう, Oojirou)
Site name: 極東お猿帝國 or おさるな部屋

http://www.doujinshi.org/browse/circle/70763/