Many generations have passed since humanity discovered the existence of Aberrancies - second souls which, when unlocked, grants inhuman abilities. This resulted in the developing of Spirit Energy, which allowed contact between Earth and the Other Realms.

The establishment of interrealm colonies throughtout the multiverse meant that Humans are left vulnerable to dangerous otherworldly threats. In response, a new organization has been tasked to defend humanity against dark forces - The Society of Mages.

But there's a Mage recruit, by the name of Ousei Akagane, who's different among them. He was born with a second Aberrancy, a very rare phenomenon marking the unfortunate afflicted with immense guilt and fear. With the growing forces of a terrorist organization knocking at humanity's door, how would he cope with the intensifying pressure that comes with incredibly destructive power.