A special Fate/Grand Order one-shot featuring a tale of the Servant, Ashiya Douman and a strange bird.

The golden coin of destiny..., it is the golden gate that connects humans and non-humans. Obtaining this is the goal, and around the world, demons and ghosts have appeared and become involved in the world of trade. Now then, tonight as well, the sound of someone knocking on Babelheim's door can be heard... Welcome to a bizarre but fascinating world of gothic horror that peers into the darkness of human hearts.

A booklet packaged with Harta volume 26 at select stores. It's an anthology of one-shots centering on the theme of fantasy. (Source: Natalie, translated)

Drawing the figure of people who got devil's items with the hero Eugene Griffith as the main character, the trading world of devils, humans and spirits incorporated by holding gold coins called fate gold coins http://urasunday.com/babelheim/index.html