Fate/Grand Order Lostbelt No. 1: Anastasia

On that fateful day, the future was wiped clean. Invaders from another world have swept aside human history, bringing everything back to the beginning. Our achievements were undone, and Proper Human History was no longer even a part of the past. The observatory is frozen, and the world itself split into seven Lostbelts. And now... After three months of silence, the last remaining humans surface from the Sea of Void. They journey through a frigid, icy world, shut out from history. March, 2020... The battle to reclaim the world and its history begins.