I JUST found out there's a spinoff Cells at Work! manga called Cells at Work! BLACK that's the same premise but the cells (it's a male RBC and a female WBC this time) live in "a poorly maintained, middle-aged body burdened by issues such as stress, smoking, drinking and the like".

"Chapters usually consist of the cells having to face an ailment, vice or symptom of an unhealthy lifestyle, and overcoming it with the help of medications.

The series is set to tackle darker content than the original, thus the name 'BLACK'."

Damn dude. And here I was wondering why they didn't go that route. Turns out someone did. XD