In Academy City, there were countless urban legends.
One of them went like this.
It was said that somewhere in Academy City stood an advanced research facility beyond the reach of even the latest modern technology.
Some said that facility was what Academy City had looked like before its birth. Some said it had been the first research facility in Academy City. Some claimed it was still secretly controlling the city's operations, while others said it was hidden somewhere no one could find, quietly waiting for someone to open it.
This research facility was known as—"Imaginary Number District: Five Elements Agency."
Rumors of the Agency occasionally spread even beyond Academy City, and some magicians from the magic factions had heard its name as well.
Those magicians unanimously believed that this research facility was actually the residence of Academy City's chairman, the Building with No Windows where a man named Aureolus lived.
However, that was mistaken speculation.
In truth, the Imaginary Number District: Five Elements Agency was not an institution at all, but a world.
That world had no shadows.
That world had no weight.
That world had no air.
That world did not exist within human perception. No one could observe it.
Its true form was a fictional world created from the AIM Diffusion Fields emitted by Espers.
Aureolus called it this.
"Artificial Heavenly Realm."
That was right.
The Imaginary Number District: Five Elements Agency was the prototype of the Artificial Heavenly Realm.
Only through the combined AIM Diffusion Fields emitted by nearly 2.3 million Espers in Academy City could that fictional world exist.
And if a fictional world could be formed through AIM Diffusion Fields, then fictional humans naturally could be as well.
The AIM Diffusion Fields emitted by Espers with pyrokinesis could provide body temperature.
The AIM Diffusion