Cells at Work! (Japanese: はたらく細胞, Hepburn: Hataraku Saibō) is a Japanese manga series written and illustrated by Akane Shimizu. It features the anthropomorphized cells of a human body, with the two main protagonists being a red blood cell and a white blood cell she frequently encounters. It was serialized in Kodansha's shōnen manga magazine Monthly Shōnen Sirius from January 2015 to January 2021. It is licensed in North America by Kodansha USA. An spin-off manga series, Cells at Work! Code Black, was published from 2018 to 2021. The series has been adapted into an anime television series by David Production, with two seasons broadcast from July 2018 to February 2021, totaling 21 episodes. A theatrical anime titled "Hataraku Saibō!!" Saikyō no Teki, Futatabi. Karada no Naka wa "Chō" Ōsawagi! premiered in September 2020.
酸素を運ぶ赤血球、細菌と戦う白血球といった細胞たちが織り成す“体内細胞擬人化ストーリー”。人の細胞の数、およそ37兆個(新説)。その細胞たちは、体という世界の中で、今日も元気に休むことなく働いている。そこには、知られざる細胞たちのドラマがあった。
毎日せっせと体中に酸素を運ぶ、 新米赤血球。 しかし彼の職場の労働環境は、 徹底的にブラック──！！ 飲酒、喫煙、ストレス、睡眠不足…… 不健康の総合商社のような世界で、 過重労働の末に細胞たちは何を思うのか？ これは、あなたの体の物語──。
