[DeepL Translation - needs review] Volume 1 Introduction: A new red blood cell carries oxygen to the body every day. However, the working environment in his workplace (the world) is thoroughly black--! Drinking, smoking, stress, and lack of sleep...... in a world that is a general trading company of ill-health, what do the cells think after overworking? This is the story of your body--.
(Translator: DeepL)
Perhaps not so difficult if good at Kanji.
There are some vocabularies, but not grammar itself.
I like the storyline. Not too naive, but from interesting perspective. (Cells are worker humans?)