Weekly Young Sunday
The original manga ran in "Shōnen Sunday Zōkan", but when Masami Yuki began serializing "Kyūkyoku Chōjin R" in "Weekly Shōnen Sunday" it began appearing infrequently, and was eventually abandoned. Only one volume was ever collected. From 2002 to 2012, Masami Yuki moved to "Weekly Young Sunday", a seinen magazine, and produced "Birdy the Mighty Evolution", a new version of the story.