When the world powers began to crumble, the world entered a Golden Age for terrorists that filled the power vacuum. With nobody to regulate the growing crime empires, organizations such as ESPER arose, able to rival many world militaries in power and technology. ESPER was founded by a mysterious man only going by The Ishijima Kairo, literally meaning The Victorious Stone Island. He leads the group with his officers, who are experts in various fields, such as infiltration and interrogation.