Let's be blunt. If you get off on female rape, torture, and humiliation, you'll love this.
Otherwise, what little back story or plot they have is just a vehicle to get to the rape scenes. This series has literally no other purpose than to provide arousal material for those who get off on the sexual torture and mind breaking of women.
The sad part is that the back story of some of the works could make for an interesting commentary on a world where female rape and degradation is the norm, and if this had been given some more attention, the plot just might have something other than the niche it panders to as a raison d'etre.
As it is, it's a never ending pornographic misogyny fest barely disguised as a story series.