The word is derived from Greek. It translates as “human prosperity and flourishing” and “blessed people.” It indicates that the pavilion will consider the harmony of mankind and the future of mankind.

A city that exists “somewhere other than here.” Guided by advanced technologies such as <Beings> and <Cherubim>, it offers its citizens freedom and lasting peace through a state of "harmony."

An organization responsible for the administrative management and policy planning of <AO>. Its central operations are housed within a building of the same name, located at the heart of the city.

A wristband-type healthcare device provided to all AO citizens. Users’ biometric data is transmitted to and managed by the Nexus through the device, known as "Being," reducing the theoretical risk of illness and accidents to a near-zero minimum. It serves as a core component of the system that upholds citizens’ well-being and the city's stability, and it also stands as a symbolic representation of AO itself.

A collective term for the staff working at the Nexus.

A high-density display technology also referred to as an "Information Projection Membrane." With its ability to replicate textures and shadows in fine detail, it is deployed throughout AO on surfaces ranging from interior and exterior building walls to public roadways. As a result, it functions as a core element of the city’s display infrastructure. Consequently, physical information devices such as traffic lights, road signs, billboards, and public notice boards are virtually nonexistent in AO.

A next-generation transfer system. By amplifying the spacetime distortions that naturally exist within AO, it temporarily connects to alternate worlds, enabling the movement of people and objects between them. Although still in the experimental phase, multiple units are believed to exist.

A title meaning “the one who guides.” It refers to the role held by Rio, the leader of Nexus.

A designation meaning “the one who stirs up disorder,” assigned to Noah by the Nexus authorities.

An airship used by Noa’s faction, originally under AO’s control before being seized and modified. Equipped with loudspeakers and a movable exterior deck, it is believed to have been used for public announcements and promotional activities within AO, due to its surface being covered in Cherubim. By repurposing the Cherubim coating, the airship is also capable of basic optical camouflage.

The area where Noah and her group have established their hideout. Although commonly referred to as an “island,” it is actually a sandbank surrounded on all sides by rivers. It is broadly divided into three main sectors: District α, District β, and District γ. Residents continue to live using the infrastructure left over from the time when the area was under AO’s control.

The head of AO and its appointed "Mentor," he is a researcher involved in the development of the "Being" healthcare device and the information projection membrane known as "Cherubim." His vision is for humanity to achieve a future of holistic health—both physical and mental—and to become prosperous, enduring ancestors for generations to come.

An individual engaged in agitational activities within AO. Her actions, often carried out in a guerrilla-like fashion, disrupt the harmony of the city and undermine the well-being of its citizens. For this reason, the Nexus authorities have designated her a high-risk individual under the codename “Fomenter.” While the specific methods and impact of her agitation remain unclear, it is suspected that equipment stolen from AO may be involved in her operations.

A young girl who admires Noah. She has been by her side since the early days of his agitational activities. Proficient in mechanical engineering, she is responsible not only for piloting the ARK but also for maintaining and repairing the island’s infrastructure.

An 18-year-old who lives somewhere in Japan but is nowhere to be found. A virtual singer at the forefront of the next generation of artists. Since October 2018, KAF has been performing using a 3D-modeled avatar without revealing her true face. She has over 150 million YouTube views and a passionate fan community in and outside Japan.

Mori Calliope is a virtual artist popular not only in Japan but also around the world. She has attracted many music fans with her one-and-only unique lyrics, flowing freely between Japanese and English, and outstanding rap skills which lead to her major debut from Univeral Music in 2022. Her latest album “PHANTOMIME” debuted at No. 1 on the iTunes Alternative Album Chart in 10 countries/regions around the world and has charted in the US Billboard Artist 100, World Album, Top Album Sales, Heatseekers Albums and more. As she expands her global recognition as a "Made in Japan artist," her first overseas solo concert was held at Hollywood Palladium in Los Angeles with much success.