In this new spinoff of the hit manga, 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!
The red blood cells have a problem on their hands when their customers start refusing their sugar deliveries! The pancreas hasn't been producing enough insulin, and without it, sugar just keeps accumulating in the body and causing problems for every cell along the way! The red blood cells travel to the pancreas to set things right, but what they find there is a situation more hopeless than they could have imagined...one that could spell doom for them all! Will these determined cells be able to save their new home?