In the aftermath of a devastating event that leaves their planet in ruins, the survivors of Barm seek refuge on Earth, aiming to negotiate a new home. However, tragedy strikes during the talks as the Barmian leader, Leon, is betrayed and the blame lands on the Earth delegation. Amidst the turmoil, Earth's representative, Doctor Isamu Ryuuzaki, meets a tragic end. As tensions escalate, the Valerians unleash a wave of terror on Earth, commanded by Leon's vengeful son, Admiral Richter, and his Mecha Soldiers. The planet's fate rests on the shoulders of the martial arts expert super robot, Daimos, and its pilot Kazuya Ryuuzaki. Yet, everything changes when Kazuya crosses paths with Erika, a mysterious girl and Richter's sibling, leading to a forbidden love that challenges their beliefs about their own kin and the enemy.