Fate/Demon goddess

I had an idea of putting a previously dropped character and putting into the fate universe, so I binged the anime to know the character and plot, this is what boredom will do to a man sadness indeed and also there are already a bunch of Fate FF already so don't expect this to be unique out of the other FF the book cover sauce: https://twitter.com/li_nauu/status/1766395201365635133