From Kodansha:
In the year A.C. (After Colony) 195, humankind had flown its nest, the Earth, to search for new hope while living in space colonies. However, the United Earth Sphere Alliance has used its military might under the guise of “justice and peace” to seize control of some colonies, and those colonies have lost their autonomy and have been forced into silence. But the seeds of resistance have not been entirely crushed. “Operation Meteor” is about to take flight.