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.