Artist.

Japanese name: 義谷 元日 (Yoshitani Motoka) (reading is a best guess)
Circle name: ふぇすた。 (Festa.)

See also

• Pixiv account: http://www.pixiv.net/member.php?id=2637975
• The Doujinshi & Manga Lexicon: http://doujinshi.mugimugi.org/browse/circle/1645/