Based on the Murder arc in the manga, these OVAs seem to follow the story very strictly.
As with the Book of Circus, the animation is wonderful and the art is beautiful as always. If you were disappointed by the first and second seasons of Kuroshitsuji, I think you'll be pleased with these new seasons. It is still a good blend of humor and friendship as well as darkness and suffering, and shouldn't be taken lightly.
That being said, if you like murder mysteries (which Kuroshitsuji is full of) then you will definitely enjoy this one. Even having previously known how this would end, some of the twists are still quite cool and entertaining, not boring in the slightest.
