Artist, illustrator.

Artist name: udk
Circle name: ＠bgrund (あぶぐるんど)
Site name: abgrund (named after Nietzsche's quote)

Second nickname: 犀川四月 (reading is given as Saikawa Uduki/Uzuki)
Second site name: AISIROOP

See also

• abgrund webpage: http://abgrund.sakura.ne.jp/
• AISIROOP webpage: http://aisiroop.blog.fc2.com/
• Circle blog(non-adult): http://sigwblog.blog100.fc2.com/
• Tinami account: http://www.tinami.com/creator/profile/21176
• Pixiv account: http://www.pixiv.net/member.php?id=63996
• Circle.ms: http://portal.circle.ms/Circle/Index/10003729
• Twitter account: https://twitter.com/yusaberry
• Twitpic account: http://twitpic.com/photos/yusa48s
• Old circle webpage (dead, and the URL was sold to someone else): http://udk.jpn.org/