Hataraku Saibou / Cells at Work! - The comparison of cells

>Platelet turns into Umaru when it's unhealthy

I like that in BLACK, due to unhealthy body, Red Blood Cells have to carry more heavy stuff than vanilla ver., and White Blood Cells have to be more heavily armed with like, larger blades than the original knifes. Looks darker and grittier.
BTW, has the spin off out yet and how many volumes's released?