More like a 3.5 star for this volume in particular. The entire series itself I give a 4 stars!! This final volume felt a bit rushed... Which it also was written in a jump from 2017 of the 5th volume to 2021... And as you can guess, COVID-19 comes into play at the end. This volume also felt really jumbled in terms of story.
This series overall though was actually very enticing, extremely educational and entertaining!!! Think of it as Osmosis Jones meets Dragonball Z to some extent. If you like either one, or both like I do, you'll love this series. My favorite volume of all was volume 5. The story was truly brought together and made it a very interesting read, zipped right through it. It also was the largest volume in the series. Kind of thought volume 6 was unnecessary, but nonetheless still had some entertaining bits to it. Learn something new every day, in this particular series, behind the human biology! Now every time I get sick or scrape my skin, or get a cut, I will always imagine the little cell workers in my body being at work!!! Best way to handle sickness or an injury!!