Fate/Grand Order: Moonlight/Lostroom
Genres: Action, Fantasy, Supernatural
Type: Special, Episodes: 1
Aired: Dec 31, 2017
Studio: Lay-duce
Source: Game
Rating: PG-13 - Teens 13 or older
Synopsis:
Short centering 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.

(Source: ANN)