In an undefined time, men are totally assisted by machines called "intellects", which, thanks to the "B-01" program, provide them with a quasi-artificial life. A resistance, the Black Line, claims the existence of a legendary city symbolically called Babylon, devoid of intellects, a world of peace ...The young Ael, fervent admirer of the Black Line and dependent on the technology of the "intellects", will meet Abelia, a young mercenary of the league. She will try to make him join the terrorist group, but is intercepted. Ael is going to be the object of a merciless manhunt.
—Anonymous.