Cells at Work! Code Black Vol. 3 (manga)

CHANGING CAREERS

Having survived a heart attack, the body is starting to regain a bit of peace. The red blood cells are excited to finally be working in a non-exploitative work environment, but one day, a mysterious tube punctures the blood vessel and sucks up every blood cell in sight! When the cells come to, they're in a different body altogether--and the new offices might just be worse than the old ones...