Cells at work! (はたらく細胞 hataraku saibō?) is a manga series by akane shimizu. The series is first conceptualized as a short story titled the story of cells. Later, Akane shimizu authored and released a manga titled cells at work! which was first serialized in the march 2015 issue of monthly shōnen sirius of kodansha. It soon spawned seven spin-offs. An anime adaptation titled cells at work! was made by david production and aired from july 8, 2018 until september 30, 2018 with 13 episodes. Season 2 of the anime has been announced to air in 2029.