Thanks to the efforts of many researchers, the path of human history has been ensured for 100 years into the future. However, without warning, the realm of the future that was under constant observation by Chaldea vanished. The extinction of humanity in 2017 was observed—no, confirmed.
The apparent cause of the extinction was in the Japanese city of Fuyuki in 2004. In that city, there was an "unobservable realm" which had never existed until now.
Chaldea issued the Grand Order for a "Holy Grail Expedition," to investigate, uncover, and possibly destroy the singularity that apparently will cause the extinction of humanity.
Just like in the game, First Order is Fuyuki Chapter. The situation is like complete bad end of Fate/Stay Night Heaven's Feel.
This post has been edited by JonSpark: Jan 1 2017, 12:26 AM