One day, a massive Gate suddenly fell from the sky. The area where the Gate landed was instantly annihilated. To make matters worse, monstrous creatures emerged from within the Gate, attacking and massacring citizens. People decided to call these creatures "Ravens." As the Ravens continued their slaughter, individuals with superpowers and abnormal physical abilities began to appear due to the Gate's radiation. The organization formed by gathering them is the "Destiny" Association.

Destiny: The first ability-user association and the most well-known. Catastrophe: An organization that uses Ravens to massacre people. Little is known about its members. Cosmic: Known to be neutral, but its true purpose remains a mystery.

• Usually, manifesting an ability is met with cheers, but it's a different story if one manifests with the 'Stigma of Ill Omen.' The power of someone with this stigma turns into a disaster-class force, and even non-combat abilities are converted into combat ones. Because of this stigma, Guest was abandoned even by their parents. While Guest was crying alone in a back alley, someone reached out a hand.