Fate/Grand Order - Moonlight/Lostroom is an anime short original story produced by Lay-duceWP and written by Kinoko Nasu that aired on December 31, 2017. It centers on a "Lost Room" where you can find what was lost — or those who lost. This room, which belongs to no one, lies forgotten in a corner of Chaldea. It serves as a transition between Epic of Remnant and Cosmos in the Lostbelt, parts 1.5 and 2 respectively of the story of Fate/Grand Order.
- Fate/Grand Order Gets 2 New Year's Eve Anime Shorts. Anime News Network (2017-12-09).