Artist.
Japanese name: しいな, 椎奈 or 417 (reading is Shiina)
https://www.pixiv.net/users/1393157
https://www.pixiv.net/stacc/ichijo417
https://twitter.com/ichijo417
https://twitter.com/intent/user?user_id=56354964
https://sketch.pixiv.net/@ichijo417
http://theinterviews.jp/ichijo417
http://twitpic.com/photos/ichijo417