This manga was... a little up and down to say the least.
Let me give you a little background first: at this point, I have already read all the other manga that Diabolik Lovers has to offer, other than the Diabolik Lovers Sequel and More, Blood: Mukami-Hen, in addition to watching the full two seasons of the anime including the recap episode and the OVA. Question is: how does this manga compare to the others?
The story, as usual, isn't very good. I think that you should read this after watching the second season of Diabolik Lovers, if you're going to watch the anime. I
think that even if you hated the anime (if it was due to the lack of consent) then you might still like this because of the fact that Yui kinda identifies as a masochist, so a lot of the stuff going on doesn't seem as bad. This reads like BDSM one shots.
The art was pretty good. It was clean and easy to discern, though some chapters seemed to have lesser quality somehow.
The characters... well, some boys got sweeter, some got worse, Yui got a little more tolerable, to say the least. If you want to insert yourself in there, Yui isn't exactly making it difficult. The boys have no character outside of stereotypes and pursuing Yui, so it's a little annoying in that aspect, but other than that, if you're reading for romance, this is probably not that bad of an option.
I enjoyed it enough. I like reading manga at night to get my head to settle down, so this did the job. It was interesting enough (or perhaps it's just because all the chapters were mercifully short) that I could get through it without falling asleep, though I got sleepy towards the end.
Overall, I suppose this was 'good enough'.
I would recommend this if: you're into BDSM, you like one-shots, you don't mind dubious consent, you like forceful guys, you're not here for a plotline
I would NOT recommend this if: you like clear consent, you like fluffy romance, you wanted an actual storyline, you like nice guys
If you came here for romance manga, I would recommend the following instead of DLM,B: Hapi Mari, Nobara no Hanayome, Sennen no Yuki, Reimei no Arcana, or Soredemo Sekai wa Utsukushii.