The third of Tadao Nagahama's Romance Super Robot Trilogy. (#1: Chou Denji Robo Combattler V, #2: Chou Denji Machine Voltes V)
After the destruction of their home world, the survivors of the planet Barm head toward Earth with the goal of negotiating the purchase of land to emigrate to. Unfortunately, during the negotiations, the Barmian's leader, Leon, is assassinated by his second in command, Olban, and the delegation from Earth is framed for the murder. In the ensuing chaos, Doctor Isamu Ryuuzaki of the Earth delegation is shot and killed.
Shortly after the disastrous end of the talks, the Barmians (called "Valerians" in Starbirds) begin a campaign of terror against Earth, lead by Leon's son, Admiral Richter, who deploys a variety of "Mecha Soldiers" against the planet's defenses. The only thing standing between the Earthlings and annihilation is the transforming, karate-using super robot, Daimos, and its pilot, Kazuya Ryuuzaki. But that changes when he meets and falls in love with a mysterious girl named Erika, who turns out to be Richter's sister. Over the course of their struggles to reunite, Kazuya and Erika each learn that the other's people are not all evil... and that their own people are not all good.
Well, I started watching this anime thinking "this is gonna be one more of those 70's super robot anime where a somewhat random gets chosen to pilot the robot and he shouts every move he makes and he basically just fights the monster of the week".
And, to some extent, I was right, as that is what happens in more than half of the episodes, but fortunately that's not the only thing that happens.
Recapitulating, the story is about a race of human-like aliens attacks the earth as they need a new planet to live, but it won't be a straightforward plot as we will have
power struggles, rebellions, coup d'etats, treason and moral issues like pacifism and obedience in the mix. So, it's an interesting story!
The mecha fights are probably the least interesting part of the show, just what you would expect coming out from Mazinger or any super robot anime.