Marriage of God & Soul Godannar!!

The history is placed right after the -cliffhanger- end of Godannar when Anna looks surprised to see Mira driving the Neo Okusaer.

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 homeworld, the survivors of the planet Barm head towards 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.

Marg was deprived his little brother, Mars, by Zure, and lost his parents. Therefore, he was living alone on the planet, Gishin. He became a member of guerrilla to riot against the dictator Zure, and he fell in love with Ruru, the daughter of the leader, Ura. However, the organization was destroyed. He was trapped by Zure, and he was brainwashed to become a soldier. Then, his long cherished wish that he would meet his brother again was realized… as a duel with him.

Akira Akebono, a young boy who is competing in a robot tournament where many of the robots are capable of transforming into animal forms. Akira wants to win the ultimate prize, the Titan Belt, with the help of his group of robots, all of which are capable of forming into the robot Daigunder. Daigunder is the creation of Akira's father, Professor Hajime Akebono. Together with a girl named Haruka, they compete under the name of Team Akira. However, Team Akira faces opposition from not only their competition, but a robot named Ginzan who is under the control of the evil Professor Maelstrom.