Reyvateil
There is a rare species of people in this world known as Reyvateil. The heroines in this game, Aurica and Misha, are different kinds of Reyvateils.
Aurica is a Third Generation, a mixed breed between Humans and Reyvateils. Not all mixed children become Reyvateils; only those born with the abilities can develop powers.
Reyvateils are always born female. Their characteristics include a very short life span and a tattoo called an Installer port that appears somewhere on their body.
Misha is a Pureblooded B-type, a genuine Reyvateil. They are similar to the Third Generation, except they have a very long life span and remain youthful until they are destroyed. They also have a tremendous amount of power, incomparable to those of the Third Generation.
Tenba & the Elemia Church
In the isolated world of Sol Ciel, people live on a floating island called the Wings of Horus.
There are two major organizations on this island: The Tenba Conglomerate, who try to use the lost technology found on the Tower to improve people's lifestyles, and the Elemia Church. The Elemia Church's goal is to revive the Trio of Elemia to lead the people to happiness. They take care of Reyvateils and use their power to help people, improving their lifestyles that way.
The two disasters that lead the world to destruction
In the past, Sol Ciel has experienced two major disasters that almost led to the end of the world. The land and sky were lost in the first disaster; the super civilization was lost in the second.
It is now the Third Era, the dawn of a new age. A time where people must cling to the Tower of Ar tonelico for their very lives.
Wings of Horus
A continent that floats on the outer walls of the Tower, most inhabitants of Sol Ciel live here. The Tower has granted them a technology called Grathmeld. People worked on this skill, and though their civilization was not highly advanced, they were able to enjoy a modest prosperity.
During the second disaster, one wing of the Tower had been destroyed. Along with many people, it disappeared into the rubble of the Sea of Death. Currently, only one of the Wings of Horus still exists.
Virus
They are born from the Altar of Apostles, but should not actually exist in physical forms. Most have the intent to cause harm to people.
In the upper levels of the Tower, the administrator, Shurelia, and her Knights of Elemia work to exterminate them. However, they also appear in the lower levels and the Wings of Horus, troubling the residents.
The knights of the Elemia Church and the mercenaries of Tenba have their forces to fight back against these outbreaks.
Apostles of Elemia
People who live in the upper levels of the Tower, in the city of Platina, are called Apostles of Elemia. The administrator, Shurelia, leads these people, the descendants of those who created the Tower of Ar tonelico in the past.
Their role is to maintain and preserve the operations of the Tower, and exterminate virus outbreaks from the Altar of Apostles. Lyner, the main character, becomes a Knight of Elemia to guard Shurelia.
Cosmosphere
In this world, "sound" exists as a natural wave that can be found anywhere. Through this, all Reyvateils are unconsciously connected to the Tower.
Each Reyvateil has a Standard Spiritual Frequency, and those with similar values can synchronize better (such as getting along better, or thinking the same way).
Based on a spectrum that uses this frequency wave, each Reyvateil's Logic (i.e., algorithms of programs, AI of robots) creates their consciousness and way of thought, which then shapes the individual. It is therefore very important to maintain this Logic.
During the era when Reyvateils were created, it was said to be possible to completely change their personality and consciousness with maintenance. But controlling the personality and memories would only occur in an extremely special case (since there was a time when people fought for Reyvateils' rights). So in reality, the process was mainly to [craft Songs = make magic].
The Reyvateils' Logic is referred to as a Cosmosphere, and is called the soulspace in the Third Era. The Cosmosphere, whether near or far, is always connected to the Tower, and is also connected to other Reyvateils.
Hymn Crystal (Hymns)
Hymns are songs that can control the Tower. Normally, these Hymns are sealed within a crystal.
When they are installed, a control key called the Hymn Code can be retrieved and used to activate its powers. In this story, Aurica and Misha use these Hymns to overcome many obstacles during their adventure.
Characters
LYNER BARSETT
"Hey, can't we just stop fighting? It's such a small world."
The main character. A very energetic young man with an adventurer's heart. He has a strong sense of responsibility, and hates dishonesty.
Although he often overreacts, he is hesitant when it comes to relationships (or rather just indecisive). He has a strong sense of responsibility, and is an energetic young man.
He was born in a city called Platina in the upper levels of the Tower. His father is a political official (currently the Commander of Platina), and so he is taught the ways of politics. But he has no interest whatsoever, and decides to pick up a sword and join the Knights of Elemia in search of adventure.