Alright so here is my cosmology post of Instant Death. Keep in mind I will ONLY be doing the cosmology in Instant Death. I will not be including cosmology from any other of Fujitaka’s works. Now that we got that out of the way, let us start!

Celestial Foundations/Heavenly Records

The Celestial Foundation (also called Heavenly Record) is the universe/timeline itself. Differently from a normal timeline, a celestial foundation consists of not only the universe, but also a vessel/canopy that envelops said universe.
Celestial Foundations also contain everything that makes up the universe on a conceptual level. And as we know, dimensions are just elements of a universe, therefore a Celestial Foundation contains the very concept of dimensions. The Celestial Foundation is capable of containing multiple timelines simultaneously. Whenever Darian died, his soul was able to travel back in time. Every time he travelled back to the past because of his death, it created an entirely different timeline. There are also numerous parallel worlds in a Celestial Foundation. This is supported by Lynel’s Random Walk ability. Every time he dies, he is sent to parallel universes with different possibilities to ensure his survival. And he is stated to have died “countless times”. And we see this multiple times.

The Abyss

The Abyss is a 4th dimensional plane that is presumably within the celestial foundation of Yogiri’s original world before he was isekai’d. It contains 4 spatial dimensions and seemingly one of time, as the King could age and starve to death while inside it.

The Sea

The Sea is a multiverse that contains all celestial foundations. It is stated possess a countless amount of them. The foundations are structured in a stacked abstract vertical hierarchy. The energy flows from the top to bottom, and due to that, one needs a tremendous amount of power to transfer from a lower world to a higher world. The Sea is also stated to be an infinite space

Celestial Foundation Eaters/Heavenly Record Eaters

Celestial Foundation Eaters are cosmic beings of immense size that swims throughout the Sea. They are big enough to dwarf entire celestial foundations and constantly eat those for nourishment, but also for consumption of knowledge and raw information derived from them. Celestial Foundation Eaters are also described as being on the level of a god.

Celestial Axis

The Celestial Axis connects all Celestial Foundations. By going through it you can visit all sorts of worlds. The Celestial Axis is not physical, but rather a conceptual corridor that connects all worlds.

Higher Universes

The higher universes (not to be confused with universes higher in the hierarchy of the Sea), are universes situated beyond the Sea. Taking UEG’s statement into account after Toichirou managed to step into a higher universe, it is implied that they are “much more of a higher-dimensional” structure than the Sea. In addition, each higher universe is contained by a larger higher universe, which is in turn contained by a yet larger higher-universe, and so on. And each of those higher universes were equated to a higher dimension that consequently dwarfs the previous. Also when UEG was fighting Toichirou, they jumped to higher universes and even outside of the dimensional space. There might be an infinite amount of higher universes. While it is more or less implied to be a theory from Kouryu’s part, half of it was already directly proven true in the battle of UEG against Toichirou. One might say that the higher universes being considered “higher-dimensional” would be a contradiction (since they are above Celestial Foundations, which already contain the concept of dimensions) but not necessarily. Lower universes or Celestial Foundations are stated to be “in and of itself” (existing of its own capacity or independently) and being the foundation of everything on a conceptual level it’d be conceptually isolated from anything else. The reason why this would apply to the higher universes is because the higher universes which contain and dwarf the lower ones would also as a result have their own higher concepts or foundation “in and of itself” that everything is a part of as they do not share the concepts of the lower worlds. This is further supported by them having their own laws.

Ultimate Ensemble World

The Ultimate Ensemble World is everything that exists, which includes the Sea, Celestial Foundations, and everything above. The Ultimate Ensemble World is the totality of existence.

Mysterious Space

The Mysterious Space (Otherwise known as the Q&A Corner) is (like the name says) a mysterious space. It is a place outside of the main novels and also outside Space and Time. This means that beings in the Mysterious Space view the entire story (Instant Death) as fiction.

The End

Outside of all of this is The End (In other words, Yogiri’s true form.) It is described as the natural limiter of reality where nothing is beyond it to the point that Fate and Plot are nothing more than a joke to it. It is even described as the inevitable destination of all fates, beyond which there is nothing. And also the embodiment of nonexistence itself. The End also exists across Space and Time since the very beginning. According to the author (Tsuyoshi Fujitaka), this true form is beyond the concept of dimensions entirely, to the point where no amount of dimensional stacking would be able to reach it.

Anyways that marks the end of my cosmology post. Someday I might make another one but include cosmology from Neechan wa Chuunibyou and Unbeatable Demon King (Unless someone does it before me lol) Anyways. Apparently the novel uses the same kanji as Max Tegmark’s Ultimate Ensemble. I didn’t really care to read it (even though I probably should…) but yeah… anyways this is the end. Hope you enjoyed! Feel free to share this, quote this, whatever you want idc… Bye-Bye now!