Birdy the Mighty

Birdy the Mighty (鉄腕バーディー, Tetsuwan Bādī) was a Japanese manga written and illustrated by Masami Yuki. Originally published on Shōnen Sunday Zōkan from 1985 to 1988, the series was abandoned by its author and the unfinished work was published by Shogakukan as "Volume 1". In 1996 it was adapted into a four part OVA with the same name by Madhouse, Inc.

In 2002 Masami Yuki rebooted the series and it was published in Weekly Young Sunday until 2008, it had the same name as the original manga and was collected by Shogakukan into 20 volumes, several months after it ceased publication a sequel called Birdy the Mighty: Evolution began releasing on the same magazine, Evolution ceased publication in 2012 and roughly a month afterwards an epilogue chapter was released on Monthly Big Comic Spirits and was collected into 13 volumes.

In 2008 Birdy the Mighty: Decode was released as a 13 episode anime animated by A-1 Pictures, it was followed by a second season Birdy the Mighty: Decode 02 featuring 12 episodes and an unaired episode connecting the two seasons called Birdy the Mighty Decode: The Cipher.

Due to the many Adaptations, Birdy the Mighty has four different continuities, the original 1985 manga, the 1996 OVA, the reboot manga including Evolution and lastly Decode, while the general premise of the story remains consistent between all of them, the details may differ greatly up to and including exclusive side characters, different personality traits to main characters and completely different motivations.