Hard to explain the story in short sentences, but I would certainly try.
1. In the future, man kind colonized other planets.
2. This is on a off-world colonized planet, at where a social experiment is taking place.
3. The experiment is to confirm that human society has limited self-correct ability.
4. On this planet, magic is real and magical practice could be achieved.
5. Via a certain type of parasites as communication agent, magic performances are practical.
6. The agent parasites form an antenna-like metal deposition under magician's skull.
7. Magic performance is implemented by receiving orders from magicians wirelessly, then trigger certain energy operation as ordered.
8. This facility was built to serve as a top-level energy operating center.
9. People who want to end dark ages, break into this facility, fighting securities.
10. Securities are normal people who were kidnapped and brainwashed, even been cybernetic enhanced to protect the facility from external invasion.
11. Some of the kidnapped people were built into combat machines, serve as processing unit.