A newbie Red Blood Cell is one of 37 trillion working to keep this body running. But something’s wrong! Stress hormones keep yelling at him to go faster. The blood vessels are crusted over with cholesterol. Ulcers, fatty liver, trouble (ahem) downstairs … It’s hard for a cell to keep working when every day is a CODE BLACK!
 
(Source: Kodansha USA)

From Akane Shimizu, winner of Shounen Sirius' Rookie Award, comes an informative tale about anthropomorthized cells!
 
Strep throat! Hay fever! Influenza! The world is a dangerous place for a red blood cell just trying to get her deliveries finished. Fortunately, she’s not alone … She’s got a whole human body’s worth of cells ready to help out! The mysterious white blood cell, the buff and brash killer T cell, the nerdy neuron, even the cute little platelets—everyone’s got to come together if they want to keep you healthy!
 
(Source: Kodansha Comics & MangaUpdates)
 
Note: Contains the spin-off one-shot "Hataraku Saibou: Kansen-hen".

A rookie Red Blood Cell has been bustling about, frantically making oxygen deliveries all around the body! But his workplace is on the brink of going Code Black!! Drinking, smoking, stress, sleep deprivation... Struggling to survive a life not unlike the brutal corporate world, what must these overworked cells be thinking at the end of the day? This is a tale about the inside of your body... 
 
(Source: Funimation) 
 
Notes: 
- The episodes were streamed two days ahead of the Japanese broadcast on Funimation beginning on Jan 8, 2021 at 2:30 JST. The regular TV broadcast started on Jan 10, 2021 at 0:00 JST. 
- Episodes 3 and 4 were broadcast in Japan as a one hour special episode on Jan 19, 2021 at 1:40 JST.

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