Golgo 13

Golgo 13 (Japanese: ゴルゴ13, Hepburn: Gorugo Sātīn) is a Japanese manga series written and illustrated by Takao Saito, published in Shogakukan's seinen manga magazine Big Comic since October 1968. The series follows the title character, a professional assassin for hire. Golgo 13 is the oldest manga still in publication, and its tankōbon edition was certified by Guinness World Records as the highest number of volumes for a manga series. Saito said before his death in 2021 that he wanted the manga to continue on without him and previously raised concerns the manga may be unfinished after he passes away…Wikipedia