Short answers, pulled from the story.
Naoki Urasawa wrote and illustrated Monster, which Shogakukan serialized in the magazine Big Comic Original from December 1994 to the 20th of December 2001. Takashi Nagasaki is credited as co-producer of the manga's story.
Monster follows Kenzo Tenma, a Japanese neurosurgeon in Düsseldorf, whose choice to save a boy named Johan Liebert instead of the city's mayor unravels his life. Johan grows into a sociopathic serial killer who murders anyone who sees his face to enforce absolute anonymity, and Tenma spends years hunting him across Germany.
The Monster anime has 74 episodes, produced by Madhouse and airing on Nippon TV from the 7th of April 2004 to the 28th of September 2005. It was directed by Masayuki Kojima and written by Tatsuhiko Urahata.
No live-action version of Monster has been completed. New Line Cinema acquired film rights in 2005 with screenwriter Josh Olson attached, and Guillermo del Toro developed an HBO pilot starting in 2013, but by 2015 del Toro said HBO had passed on the project.
Monster won the 46th Shogakukan Manga Award in 2001, the Grand Prize of the 3rd Tezuka Osamu Cultural Prize in 1999, an Excellence Prize at the first Japan Media Arts Festival in 1997, and Best Manga Series at the 2004 Lucca Comics Awards. It has also had over 20 million copies in circulation.
Netflix began streaming Monster internationally on the 1st of January 2023. Discotek Media announced in August 2025 that it had licensed the series for a Blu-ray release planned for 2026.