kumada_kazushi
Artist.
Name reading is a guess - may be unofficial.
Artist name: 熊田 一司 (Kumada Kazushi)
Old name: 熊田 惨士 (Kumada Sanshi)
See also
- Pixiv profile: http://www.pixiv.net/member.php?id=1460659
- Twitter account: http://twitter.com/Kuma_art