The Day and Night is seemingly an infinite void divided by a horizon into a dark, nightlike part and a bright, daylike part. The physics of the dimension behaves strangely, with fish swimming in the air that a human can breathe and the floor creating waterlike ripple effects while Emma walks on the surface of the Night portion. There appear to be structured in the far distance.
Demon cultural/religious significance
Being the residence of the godlike figure , the Day and Night is of much religious significance to demons. Shrines like the Cuvitidala were created by demons to view the Day and Night, however, these were abandoned. he reason for the shrines' abandonment is officially unstated, but it could be in connection to the fact that, as stated by Sonju, demons have strayed from past religiousness in recent times due to influence by the previous king.
Other places built with the Day and Night in mind were the demon temples that Emma and her friends visited, which depict art of the Day and Night on their ceilings which is referenced later on by Ray.
The easiest known entryway to the Day and Night is through the Cuvitidala. However, it is not the "correct" entryway, but only a vision, and upon entering, Emma is prompted by Him to go to the proper entrance.
Emma visits the Day and Night on two occasions, once through each entrance.
Julius Ratri entered the Day and Night in order to forge the original Promise.
The Demon King
The Demon King is the most notable inhabitant and the reason most, Emma included, seek to come to the Day and Night.
The Dragon of Cuvitidala
Spoken of in legends, the Cuvitidala Dragon is often seen alongside the Demon King. It does little but fly around and has no clear role as of yet.
Odd, fish-like fauna inhabit the Day and Night and are seen swimming around the Demon King.
- ↑ The Promised Neverland manga: Chapter 162, page 2
- ↑ The Promised Neverland manga: Chapter 136, page 18
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