In the year 20XX, humanity mostly relies on robots as military and police force, minimizing human casualties in major conflicts. These mechanical helpers work independently, having fail proofed algorithms that prevent them from harming biological life. On a fateful day, an unknown flying object suddenly appeared over new Port city. Without hesitation, the alien ship commenced their attack, using advanced technology to corrupt the robots, turning them against their creators.

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With humanities survival hanging on a threat, the last line of defense was initiated: activating G.U.N.N.R – a new type of fighting machine protected by quantum cryptographic algorithms that cannot be corrupted.

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Awaking for the first time, G.U.N.N.R only has one goal: attack aggressively!