Artist. Formerly tagged as itiyuujin.
Japanese name: 一 有人 (reading is given as Ichiyuujin [old pixiv nickname] or Ninomae Aruto [mixi])
Circle name: 筒風琴 (pipe organ)
https://www.pixiv.net/users/60279
https://www.pixiv.net/stacc/paipuorugan510
https://twitter.com/1yuujin_PXV
https://twitter.com/intent/user?user_id=793871816
https://sketch.pixiv.net/@paipuorugan510
http://mixi.jp/list_album.pl?id=5985664
http://mixi.jp/show_friend.pl?id=5985664
https://twitter.com/itiyuujin
http://twitpic.com/photos/itiyuujin
