Artist.
Japanese name: 弘原 うみ (Hirohara Umi) (reading is a best guess)
The other name: 弘原海 (Wadatsumi)
https://www.pixiv.net/users/12643981
https://www.pixiv.net/stacc/wadatsumi_s
https://twitter.com/wadatsumi_
https://twitter.com/intent/user?user_id=759728609942605824
https://seiga.nicovideo.jp/user/illust/36587582
https://www.nicovideo.jp/user/36587582
https://privatter.net/u/wadatsumi_
http://twitpic.com/photos/wadatsumi_