[1] After graduating, he moved to Tokyo to look for work and began going to a technical school for electronics, continuing to draw for fun.

[3] Lupin III made its debut on August 10, 1967, in the first issue of the magazine Weekly Manga Action; the cover was also drawn by Monkey Punch.

It went on to become an extremely popular and successful media franchise, spawning numerous manga, six animated television series, seven animated feature films, two live-action films, three OVAs, near-yearly television specials since 1989, music CDs, video games, and a musical.

[6] On April 21, 2007, Monkey Punch participated in a series of lectures on the "interaction of manga and culture throughout the world" at the Freer Gallery of Art.

For years it was widely believed that the pen name Monkey Punch referred to the two brothers working together as a creative duo, but in a 2017 interview they clarified that this idea stemmed from a mistaken magazine article, and that the name Monkey Punch should be understood to refer exclusively to the older brother Kazuhiko, who did all of the main creative work concerning the characters, story, and the main drawings.