Artist, illustrator.

Japanese name: 活断層 (かつだんそう, Katsudansou)
Old name: アライ セイリュウ (Arai Seiryuu)
Circle & site name: U-rica (the other member: Muuta_(mu-ta))
Old circle name: もう⑨なんてやめない (Sousou_(sousouya)'s circle)
The other site names: "Toy Box" and "アタマノネジ"

See also

• Tumblr gallery: http://katsudansou.tumblr.com/
• Circle website (shared with Muuta): http://u-rica.jimdo.com/
• Blog: http://kijimuna1995.blog38.fc2.com/
• Pixiv account: http://www.pixiv.net/member.php?id=1082547
• Niconico account: http://www.nicovideo.jp/user/5299555
• Niconico Seiga: http://seiga.nicovideo.jp/user/illust/5299555?target=illust_all
• Twitter account: http://twitter.com/katsudansou
• Twipple photo images: http://p.twipple.jp/user/katsudansou
• Twitpic account: http://twitpic.com/photos/katsudansou