World

The World refers to both the single reality that exists outside the Book and the infinite potential worlds that are inside the Book. Currently, the worlds' fragments are forced to be connected due to Osamu Dazai using his ability to create a point of singularity.

Description
Each potential world holds the same weight as other worlds. There are currently two known worlds, the original world and the BEAST world.

BEAST world
In this world, the Book is its origin more or less and a version of the Book also exists inside this world. However, orders from the original world can rewrite or destroy this world.