Brave of the Sun Fighbird

Tsutomu, a perfectly average student, is busy studying for his high school exams when he stumbles into a police chase in progress. Caught in the crossfire, the boy is hit and on the verge of death when he's approached by a young woman. Birdy is on the scene and, by joining her consciousness with his, manages to save him from his imminent demise. Now they share a body and will have to learn to live together as she continues her career, capturing criminals and saving lives as an interplanetary police agent.

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.

Tsutomu Senkawa is an average high school kid who is busy studying for his senior entrance exams. Tsutomu goes out for some fresh air, after a hard day's work studying for a big test, when he runs into a guy fleeing from a pretty young lady. The pursued man is actually an interplanetary criminal on the run from a Federation agent called Birdy Cephon Altera. Caught in the midst of this chase, Tsutomu gets thrown by the man at Birdy, which kills Tsutomu. Fortunately for Tsutomu, there is a way to keep him alive, although it comes at the price of discarding his body. He ends up merged into Birdy's body.

The world we live in is called Earthside in this story. There are the other worlds called Nosfertia, Heavenstia, and Eternalia. When Darknoids from Nosfertia begun invasion to Earthside, Heavenstia sent 3 Animanoids (beast-humans) to prevent it. The lead character Touya had believed that he was a mere human but found he was actually a being of Eternalia. With the help of 3 Animanoids, Touya fights to defend Earthside.