Artist. Real name unknown. Japanese nickname: 下越 (Shimokoshi)
Old nickname is simo氏 or 霜越.
Member of TYPE-MOON since 2006.
Has released several CG compilations under the circle name Walpurgis no Yoru (ワルプルギスの夜).
https://www.pixiv.net/users/56301
https://www.pixiv.net/stacc/walpurgisnacht
https://twitter.com/simosi
https://twitter.com/intent/user?user_id=18491881
https://www.deviantart.com/simosi
https://pawoo.net/@walpurgisnacht
https://sketch.pixiv.net/@walpurgisnacht
https://ja.wikipedia.org/wiki/Simo氏
https://www.animenewsnetwork.com/encyclopedia/people.php?id=200137
https://www.mobygames.com/person/995317
https://pawoo.net/web/accounts/163383
http://simosi.sakura.ne.jp/walpurgisnacht/
http://walpurgisnacht.sakura.ne.jp
https://www.doujinshi.org/browse/author/5627/Simoshi/
http://members.at.infoseek.co.jp/simosi/
http://www5.ocn.ne.jp/~eithne/
http://twitpic.com/photos/simosi
