Das Kapital is the claimed adaptation of Karl Marx's famous book under the same name, however, it is not a literal interpretation of the book, mainly because the book did infact not involve a storyline. In the manga "Das Kapital" we follow Robin, a cheese-maker who goes against his father's socialist wishes and pushes his workers into slavery while feeling guilty about it. Not a very common story for a manga, but not a very interesting one either. I'm sure this manga might be very compelling to communists and socialists, but as someone who read this trying to gain a better perspective of communism; it just really wasn'tthat good.
It's a very weak adaptation, and if you're trying to get a better view of communism you're better off reading the real thing.