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)

Fate/Grand Order: Moonlight/Lostroom takes place after the first arc of Fate/Grand Order mobile game and serves as a prequel to the second arc 'Fate Grand Order: Cosmos in the Lostbelt' of the mobile game..