assassin turned exorcist

y/n Lawson, at the age of 5, he watched as his parents lives were stripped from the human world by blue flames, Satan had taken his family away from him, so the young y/n took it upon himself to kill Satan for what he had done, he joined the agency his family had started so long ago, the Mechanics union, assassins who banish demons from the human world of assiah, sending them back to gehena, at only 8 years old, y/n banished Beelzebub from assiah, now 17 years old, the young man joins his new family, Sophie and Dan as they attend true cross academy to become exorcists and finally draw closer to eradicating demons from assiah