Invincible Revolver: I Can Kill Anything with One Shot

After the nuclear war in 2057, the world became a wasteland. Five people from China fused the fragments from the sky and became super powerful, but the sixth piece mysteriously disappeared. Changes occurred overseas, monsters were rampant, and humanity was on the verge of extinction. I awaken a revolver that can kill everything, decide life and death with one shot, and overthrow the evil spirits of the apocalypse!