Other name: Daimos
Tadao Nagahama's Romance Super Robot Trilogy's third installment. Chou Denji Robo Combattler V (#1), Chou Denji Machine Voltes V (#2)
Following the devastation of their home world, the survivors of the planet Barm go to Earth in order to negotiate the purchase of property on which to move. Unfortunately, during the discussions, the Barmian commander, Leon, is slain by his second in command, Olban, and the Earth delegation is blamed. Doctor Isamu Ryuuzaki of the Earth delegation is shot and murdered in the subsequent mayhem.
Shortly after the unfortunate conclusion of the discussions, the Barmians (referred to as "Valerians" in Starbirds) launch a terror campaign against Earth, commanded by Leon's son, Admiral Richter, who deploys a variety of "Mecha Soldiers" against Earth.