The year is 2015, the final era where magecraft still thrives. The Chaldea Security Organization recruits masters from around the world to participate in the Grand Order - a secret mission to travel back in time and prevent the extinction of humanity. Protagonist Ritsuka Fujimaru and his servant Mash Kyrielight join with six other mages to form an alliance and battle against powerful enemies in different time periods.

The Chaldea Organization must deal with the Grand Temple of Solomon, the King of Magic, which has come to destroy the world.

The Lostroom. A place where you can see what was lost, or maybe what will be lost to you in time. Existing in the innermost part of Chaldea, it is the boundary line between dream and reality where the light of the Moon shines through. Produced by the Chaldea Summoning System, the room holds a small number of worthwhile benefits to enjoy.