Universe

The Universe is the setting in which Seraph of the End story events takes place in. As with the real one, the universe features locations such as Earth with an almost identical history. Planetary bodies within the galaxy also exist. Such planets, as well as technological developments and cursed based capabilities have been accessible at some points but not others as time passes.

Details
Unlike the known real universe, in Seraph of the End there are the addition of realms such as those pertaining to demons. While the universe is a physical place, there are demon spheres which seemingly occupy an existence of their own. Constructions such as Cursed Gear are able to be formed. Powerful desires are able to fuel cursed gear powers which can enhance physical strength of their wielders. Within the universe, memories are able to be accessed from points that would be hard if not outright impossible for an individual to recollect of their own accord.

Seraphs, then vampires and Homunculus are sentient beings that have been active at certain points throughout the universes' long history. Monsters such as Horsemen of the Apocalypse among others are also able to exist. There are deities mentioned such as a God, and the Sun God Aten.

History
So far the most intelligent beings seen to exist in the universe are seraphs. Long before humans evolved on Earth, during dinosaur related eras, there was a colony of seraphs that was established. The Babel Project worked on by seraphs was to return them to paradise. The Tower of Babel was a major feature of this plan. This plan and the seraphs behind it allowed the colonization of planets. That and the Unrailed Elevator Technology which was a component of it displayed technology existing in the universe, that would be lost and not surpassed by anything in present times.

Sika Madu among other humanoid appearing seraphs desired to reach paradise, which was specified to be a location on the Sun where God resided. Simultaneously, there was the need to find the cure for a plague that was affecting seraphs. Rather than a biological based plague, a cursed one was seemingly able to exist in the universe.

Life was able to be created, where Mikaela was referred to as an experiment. The God the seraphs aspired to join had some degree of control over some sections. He reserved punishments for those who were involved in life-affecting areas such as resurrection. A rules based order by living beings such as seraphs shape events in the universe as much as naturally occurring forces.

Story
Within the universe, curse based elements affect areas disproportionately. The catastrophe was apparently a preordained event that ruined Earth. Vampires that existed surfaced to capture the remainder of humanity to enslave them. There was a seraph that was continuously summoning Four Horsemen of John to Earth where they targeted humans. Cursed gear weaponry that is able to be formed in the universe allowed humans a chance to fight back against vampires by making pact with demons. For their connection, vampires can become demons after they perish. Humanoid appearing seraphs also bear a resemblance to these beings.