Kamijou ToumaThe so-called arm cover for clerks, he wears on his arm is secret tool that counteracts the Imagine Breaker and allows him to touch magic and esper powers.Either because he never stopped to work himself to the bone for a long time world peace or because of his age, he suffers from chronic back pains. A certain old man working part time for a ward office.
But the truth is, he is a ally of justice who recieves requests from the Department of Defense and exterminates supernatural phenomenons.
(Like Kiritsugu but different from Kiritsugu)Since the main series 50 years have passed.
Meanwhile something happened and his nickname changed from "Imagine Breaker" (Illusion Killer) to "Dragon Slayer" (Angel Killer) and his catchphrase from "Such misfortune---!" to "Such blessing".He is married, but it is a mystery, who the partner is, if he has children and so on. (The reason why has nothing to do with the actual situation)Even though he understands the full story of the incident the best at this point of time, he is only on the run right now.