Codename: Gunslinger

In an era of rapid technological and economic development, people have enjoyed a wealthy and peaceful life for a long time. Geologists have discovered a new type of energy, which has plunged the world into madness. The old energy monopolies are gone and new energy companies are rising. Major financial groups organize and train their own mercenaries, and the people who emerge from the selection have their own unique skills and are invincible in the war. The best among them will pursue the glory of becoming "gun gods" throughout their lives. They are called agents.