Following a devastating conflict, Shinn Asuka loses his family and dedicates himself to seeking revenge against the Earth's Natural forces. Climbing the ranks in the ZAFT military, he eventually pilots the cutting-edge Impulse mobile suit. Meanwhile, Athrun Zala, a seasoned warrior, gets entangled in a fresh clash between Naturals and Coordinators. Tasked with mentoring the embittered Shinn, Athrun strives to prevent him from being consumed by his thirst for retribution, urging him to embrace compassion in the face of escalating turmoil.