Three hundred years ago, the world was on the brink of collapse due to atmospheric pollution. As a countermeasure, exhaust gases were stored underground. During this time, the "Great Divergence" was carried out to reduce the overpopulated surface, resulting in approximately 60% of the population living underground. This was the beginning of the "Abyss."

▫️ About "Elements" Elements refer to an energy constitution possessed by about 20% of the population. While they cannot use active abilities, they exist as a form of internal energy.

▫️ About "Abnormalities" When an individual's Element level is exceptionally high, it is called an Abnormality. Abnormalities are essentially supernatural powers. They are born extremely rarely, and their power levels vary greatly. It is believed that these manifest as mutations in the human body caused by the extreme environment of constant exposure to exhaust gases.

▫️ About the "Abyss" The Abyss is a vast underground space designed to store exhaust gases, where ordinary people cannot live long lives. Many people reside within the Abyss, which is composed of the following districts:

• 12 Districts housing everyone from commoners to the lower class: Rat, Ox, Tiger, Rabbit, Dragon, Snake, Horse, Goat, Monkey, Rooster, Dog, Pig. These districts are collectively known as the "Outskirts."

General Outskirts: Houses are basically made by piecing together scrap metal and wood. Public safety is at its worst.

Central Outskirts: Restaurants and shops begin to appear. While they look like dilapidated ruins, concrete buildings that resemble skyscrapers also stand here.

▫️ Districts for High-Ranking Citizens in the Abyss

• Seiryu Street, Byakko Block, Suzaku District, Genbu Way These districts are collectively known as the "City Center."

Each district has several large organizations in charge. Public safety is excellent. Furthermore, only these districts are highly developed, relatively less affected by exhaust gases, and shine with neon lights. It is said that only about 3% of the Abyss population can live in these districts, and entry is strictly restricted.

▫️ Technology in the Abyss Technology is relatively advanced, featuring cybernetic prosthetics, human body modification, and bio-energy extraction. However, people living in the "Outskirts" have no money and thus never receive these benefits. Weapons have also evolved, including "Gene Weapons," which are weapons with abilities extracted from Abnormality users, and "Amp Weapons," which amplify the user's own minute corresponding energy.

▫️ Famous Companies and Corporations in the Abyss

• Amaterasu Supports almost all energy in the Abyss through ultra-efficient biotechnology. One of the organizations overseeing Seiryu Street. • Ragnarok Workshop An ultra-famous weapon smithy. They manufacture everything from top-tier armaments to weapons for commoners in massive quantities. One of the organizations overseeing Byakko Block. • Jericho Security Group By paying an incredibly high monthly fee, users can have their homes or shops protected. Additionally, only those living in the City Center can request emergency help from Jericho, though high usage fees apply. One of the organizations overseeing Suzaku District. • Ceres Kitchen Co., Ltd. A famous food manufacturer. They provide a wide range of products from vegetables to meat. Their "Energy Loaf" of unknown ingredients is a popular fast food even in the Outskirts, though it doesn't taste very good.