In the year 1995, a crystalline meteor hurtled towards Earth and crashed in the forests of Aomori, spreading clouds of mysterious dust upon its impact. These dust clouds contain a mysterious substance that turns youth into Espers, human beings gifted with supernatural powers known as Sigils.

As time passes, Espers faced prejudice from normal people due to their powers, fearing that they might replace them. On that day, an organization dedicated to researching and defending Espers known as Lazuline was formed. They even built a paradise for them known as Azure City, an island located on the temperate waters of Sagami Bay, Japan.

However, Azure City was just a temporary solution to the Espers. Eldritch beings known as Deviants invaded the city and the shadow of a mysterious consortium loomed upon its inhabitants, and they must fight back for their rights to live. These are the stories of their struggles and their daily life amidst the threat posed by the evil forces.