@Pashka84 Yea, I get that if you swapped it so that all the white people are slaves and all the black people are masters then nothing would change much in history, since fundamentally that's just the color of our skins not a metric to judge our characters, but how does that play into the supremacist mythology? And what even is "the supremacist mythology"? You sure said a lot of big words without much substance to them at all.
Mind explaining to me how this is an expression of fear from white supremacists when all this manga has is a pitch black figure in the position of master? Again, that's such a shallow and narrow view, and it's kinda telling that the moment you look at it your conclusion was something extremely American-centric. 99% of people who read this would have compared it to the Victorian household setting, with the Shadows acting as masters and the Dolls acting as maids and butlers. Not slaves, mind you. Maids and butlers. In a setting whose historical influence is in a place/time where racial conflict is nowhere as prominent.
If anything, you could say the central conflict in this story's society is that between the rich and the poor, those higher in society and the workers. If, say, you swap these roles so that the Shadows are maids while the Dolls are masters then indeed it would completely change how the story plays out.
Again, put more substance or examples into what you say. Just spouting big words you borrowed from someone else isn't as big-brained as you think it is.