Summary and Preview
This is the remake version of Birdy the Mighty.
"The original manga ran in what is now Monthly Sunday, but when Masami Yuki began serializing Kyūkyoku Chōjin R in the pages of Shonen Sunday it began appearing infrequently, and was eventually abandoned. Only one volume was ever collected. In 2003 Masami Yuki moved from Shonen Sunday to Weekly Young Sunday, a seinen magazine, and began drawing a remake version, starting the story from the beginning." --Wikipedia
Tsutomu Senkawa, the main character, is killed. The end.
...or it would have been, if the one who killed him wasn't an alien investigator named "Birdy the Mighty." To take responsibility, she decides to keep Tsutomu alive by combining with him. How will Tsutomu's life change, now that his body is also that of a superhuman extraterrestrial agent's? [Reminiscence]