Hnnnnggh man Shikieiki is adorable. I've been waiting for a good Shikieiki story, this was fucking awesome. I probably wouldn't like it if Yukari were canonically responsible for Shiki gaining her position but as a doujin the setting/twist for this is really imaginative and great. The fundamental idea itself of good and evil being forgotten things that can only exist in Gensoukyou is clever and charming as hell.
Loved this, I think this author is going straight to my favourites.