For most of his career, Urasawa has written two different series simultaneously. Urasawa frequently collaborates with manga editor and author Takashi Nagasaki, to the point where Nagasaki has been called his "producer." The two met when Nagasaki was made Urasawa's editor upon his debut. Although the two continue to collaborate even after Nagasaki became freelance, they rarely socialize outside of work. With the exception of 2018's ongoing "Asadora!", none of Urasawa's manga have ever been legally available in digital formats. The author stated that he prefers physical books.