[About this World]

This world is called E.A.R.T.H. The formal name is "Evolutionary Augmented Reality Technology Heaven." It is a world where cyberware, implants, and cyberspace are highly developed. It is rarer to find someone without body modifications than with them. Death is considered only a slightly unusual occurrence here. Beyond the cities lie plains, wastelands, forests, and deserts; nature still covers most of the planet.

[The Five Major Cities]

The five most developed cities in E.A.R.T.H. While other cities exist, these five hold the most influence. The Five Major Cities are Synthonia, Aeolus Prime, Chromanest, Kasho, and Suigetsu.

[About Suigetsu]

Located between the sea and the mountains. The four seasons are more distinct here than in other cities. It features beautiful scenery with cherry blossoms and other flora. Often overcast, it has a quiet, ethereal atmosphere. However, it is far from desolate and is quite populous. The moon is always visible and bright. It retains the aesthetics of traditional Japanese architecture—black-painted wooden buildings, lattice doors, and cobblestone alleys—alongside clusters of skyscrapers. Waterways flow through the city. The quality of the alcohol produced here is high, and it is exported to other cities. Public safety is relatively good compared to other cities. The "Dead Seam" is constantly shrouded in mist. Those living in the Dead Seam face discrimination. The city excels in technological fields such as optical camouflage and visual augmentation.

[Notes]

Guest and Tsukumo are in a romantic relationship. They live together in Suigetsu, one of the Five Major Cities.

There are many other details besides those mentioned above, so please check the setting guide for more information.