A missing artist.
Japanese name: 妹撃 すたん (spelling used by the artist: "Imouchi Stan" / danbooru's official romanization: "Imouchi Sutan")
The other name: すたん (Stan or Sutan)
Site name: マッシュルーム樹海 or すたんさんのハウス
It seems to be an old account of the artist below.
Nickname: 今日も役立たず (Kyou mo Yakutatazu)
The other names: 妹撃 州丹, 妹撃 すたん (reading is given as いもうちすたん, Imouchi Sutan or Imouchi Stan) or "stan_imouchi"
Site names: 州丹庵 or 新装！州丹庵
https://www.pixiv.net/users/1783637
https://www.pixiv.net/stacc/kousonsan
https://www.pixiv.net/stacc/okomemushi
https://twitter.com/kinoshita5963
https://twitter.com/intent/user?user_id=2571140858
https://sketch.pixiv.net/@okomemushi
https://www.youtube.com/user/noobxelagnia
http://plus.google.com/u/0/106605950474309550146/posts
http://www.twitcasting.tv/stan_imouchi
http://www.ustream.tv/user/stan_imouchi
https://www.pixiv.net/users/475793
https://twitter.com/buriburi_noober
http://stanan.blog.fc2.com
http://theinterviews.jp/noobxelagnia
http://twitpic.com/photos/buriburi_noober
http://twitpic.com/photos/everyday_noob
http://twitpic.com/photos/stan_imouchi
