The term Seven Walls (七つの壁, Nanatsunokabe?) indicates an interdimensional place, accessible only through a particular "entrance", which represents an imaginary barrier that separates from the rest of living beings. The Seven Walls are actually an allegory to indicate space and time, and therefore the only way to go beyond the Seven Walls is to transcend the laws of space-time, using one's own subconsciousness and imagination within this place.
Not much is known about the history of the Seven Walls, but over the centuries, various legends have spread about this place, which tells that in the Seven Walls, it is possible to meet the highest-standing demon, the Demon King. The place, however, is not marked by any map, and nobody has succeeded in finding its exact location for centuries. The only clue is represented by an apparently-indecipherable enigma, which has spread with the passing of generations, up to James Ratri.
Seeking to find a better solution than Norman's genocide, Emma and Ray venture to the Seven Walls. They enter and become become quickly confused upon entering. as the Day and Night does not follow the laws of physics as they are used to. They are first brought to an eerie rendition of Grace Field House spawned by their subconscious, and as they venture they become more and more lost as different routes lead to the same place and the same routes lead to different places, causing them to end up in the same room over 100 times, as counted by Ray. Throughout, they hear voices saying "let's play", presumably due to Him's desire to play with them. Due to the unstable time of the Seven Walls, Emma and Ray increase and decrease in age numerous times. They typically become small children, but one point, Ray ages forward so much he forgets who he is, but is saved from getting lost in space and time by Emma, who has finally figured out the nature of the Seven Walls. After reversing time as Emma instructed, Ray goes back to the normal Demon World and Emma goes to the Day and Night to make the new promise with Him.
- ↑ The Promised Neverland Manga; Chapter 51, pages 9-10
- ↑ The Promised Neverland Manga; Chapter 51, pages 12-14, 17
- ↑ The Promised Neverland Manga; Chapter 72, pages 15-16
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