Centralfiction

Centralfiction, also known as the Dream That God Sees (神の観る夢) is the "dream" which is monitored and observed by the Master Unit Amaterasu, as well as the world that is constructed as a result.

The wielder of Amaterasu Unit was focused on the Centralfiction, Ragna the Bloodedge. If he is gone, the world ends immediately, and as long as Ragna was present in the world, the Unit kept using the Phenomenon Interventions with hoping to meet him – that is the reason why the timeline looped in a certain point, until the Calamity Trigger broke the loops by saving him.

Ragna managed to erase himself from the world and returned everyone's dreams to the Azure, to create a world from them that will not be affected by the Amaterasu Unit or the Takamagahara System. After that, Ragna went through the Forbidden Gate to be with Amaterasu.