The story is set in the year 2015, during the final era over which magic still held sway. The humanity survival and security organization Chaldea was established to observe the world that can only be seen by magic and the world that can only be measured by science — as well as to prevent the final extinction of mankind. 

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.
 
(Source: Anime News Network)

Order Change de Karada ga Irekawacchau Hanashi | 因为OrderChange而交换了身体的故事

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Isekai ni Tobasaretara Issho ni Kita Musume to Ishiki ga Irekawacchatte Naze ka Sono Musume ni Natsukarete Shimaimashita. | 被撞飞到异世界之后和一起过来的女生交换了身体不知为何我被那个女孩缠上了