In 2319 AD, mankind suffered a disastrous defeat in the "Global War". The former interstellar empire split into three major forces, and the border star belt became an uncontrolled "gray battlefield." Lu Chen, a former imperial mecha pilot, was deprived of his qualifications due to a conspiracy and became a mecha dismantler in a border garbage dump. In an accident, he awakened the "Scarlet Pulse" hidden in his body in the "forbidden weapons cabin" left by the empire - a neural link ability that can directly resonate with the core of the mecha and break through the performance limits. When the pirate legion "Iron Claw" swept across the border, and when the pursuit of old enemies ensued, Lu Chen piloted the pieced-together "Dawn" mecha and used scarlet pulses to tear through the fog of the battlefield. While pursuing the truth of the frame-up, he built a steel defense line for the border refugees in the cracks of the three major forces.
