Cells at Work! CODE BLACK

Bodily functions are coming to a halt. In this dire situation, all the cells are on the verge of losing hope, but only Red Blood Cell (AA2153) hasn't given up. Are they making us work hard because the body is unhealthy? Do we stop working because the body is going to die? After experiencing various diseases and losing his friend, the answer that Red Blood Cell (AA2153) and the other cells find is...