The manga has inspired several spinoff series such as Hataraku Saikin (Bacteria at Work), Hatarakanai Saibō (Cells That Don’t Work), Cells at Work! Code Black (Hataraku Saibō Black), Hataraku Saibō Friend, Hataraku Kesshōban-chan (Platelets at Work), Hataraku Saibō Baby (Cells at Work! Baby), and Hataraku Saibō Lady (Cells at Work! Lady).
Amazon’s listing for this year’s 20th issue of Kodansha’s Morning magazine includes a cover image that states the January 2021 anime inspired by Akane Shimizu’s Cells at Work! manga is adapting Shigemitsu Harada and Issei Hatsuyoshiya’s Cells at Work! Code Black (Hataraku Saibō Black) spinoff.
The January 2021 Cells at Work!! (with two exclamation points) anime series was previously described as the second anime season, after the first one based on Shimizu’s original manga.
Aniplex stated that the anime will screen in theaters before it airs on TV as part of the second season.