Big Comic Original
An anime adaptation was created by Madhouse, with 24 episodes airing between 1998 and 1999 in Japan on Nippon Television. An additional 15 episodes were created and released as original video animations (OVAs), bringing the total to 39 episodes. Naoki Urasawa and Takashi Nagasaki created a sequel to the series, titled "Master Keaton Remaster". Set 20 years after the original series ended, it ran in "Big Comic Original" from 2012 to 2014 and was collected into a single volume.