Birdy the Mighty

A Federation agent named Birdy Cephon Altera is pursuing extraterrestrial criminals to Earth. Tsutomu Senkawa, a high school student, is accidentally killed by her when she is chasing one of these criminals. There is a way to keep him alive, though. He eventually merges into Birdy's body and must stay there until his body is fully repaired. As a result, Tsutomu is forced to cohabitate with an attractive, powerful, and aggressive space police officer while attempting to keep his loved ones in the dark about Birdy. Birdy keeps on with her investigation in the meantime. Together, they confront a covert organization of sinister aliens who want to experiment on the unaware people of Earth.