The original 20-volume Zettai Zetsumei Dangerous Jii-san manga was adapted into the 51-episode Zettai Zetsumei: Denjarasu Jii-san television anime series in 2004-2005.
Shogakukan’s Manga ONE app has revealed that the Golgo 13 and Dangerous Jii-san series are each getting a spinoff manga on the app.
Kazutoshi Soyama’s Dangerous Riiman manga based on his Dangerous Jii-san children’s gag manga series will debut on the app on August 26.
Soyama launched the Dangerous Jii-san Ja manga in 2010 as a sequel to his Zettai Zetsumei Dangerous Jii-san manga, and ended the manga in February 2017.