Edit
Artist info
Member of the doujin circle まちお (MACHIO).
His (?) pixiv handle is chibitora and his nickname is ま△ (read "masankaku").
See also
- GYAKUKAITEN (home page): http://www.geocities.jp/web_gyakukaiten/index.html
- Pixiv account: http://www.pixiv.net/member.php?id=36604
- MACHIO blog: http://sanketubu.jugem.jp/