Spy-x-War Showdown

The best way to declare war on a spy as an ordinary person is to become a spy as well. As a spy, if you want to go to war with a powerful espionage organization, join an equally powerful espionage organization. If you are unable to join any powerful espionage organization, then establish your own espionage organization and fight until destruction or victory. This is the war of spies, telling the story of how a group of ordinary people achieved extraordinary success. — Description from novelcodex.org