Iris, in her previous life, was a "humanoid cheat" in FPS games that was criticized by everyone and cheaters, but unexpectedly came to a world dominated by "null energy" and "gun girls". Here, the Gun Girls are special life forms that manifest as weapons, and the human contractors fight side by side with them to resist the alien invasion from behind the virtual world.
Awakening the power of "Time Sequence", Iris, with a tactical awareness that transcended the times, contracted with the classic and fiery lever rifle girl Wendy, and formed a team with the AK gun girl Lina who had experienced battlefield trauma, and the aloof sniper rifle girl Charlotte. They fight in the "Void Hunting Ground" on the front line of life and death, gallop on the "Void Front" with thousands of troops, and gradually grow from rising stars in the competition to the common hope of mankind and gun girls.
However, the truth behind Null Energy is much darker than it appears. The conspiracies of the Autonomous Association, the tricks of the Eclipse World, and the sacrifices of companions followed one after another. Iris must face the fate of her "Son of Nullity", control the "Throne", lead the gun girl and the human alliance, and reach the end of the virtual world passage - there, he will make a choice that tears apart time and space: should he end everything at his own expense, or should he protect the one he loves and reshape the future of the two worlds?
This is an epic of gunfire and souls, as well as a legend of a time traveler moving from a lone wolf to the throne.
