Artist. His circle was formerly Hino Akira's circle. Probably they're the same artist or friends.

Japanese name; 舞茸 or まいたけ (Maitake)
Circle name: 山葵饅頭

See also

• Pixiv account: http://www.pixiv.net/member.php?id=13919
• Twitter account: http://twitter.com/maitake_h
• Blog: http://pixiv.cc/loose/