Glad they didn't miss anything while speeding up the plot. That is great that this anime tries to be loyal to the manga, pushing content within ~20 mins but still get the main points delivered and without major changes.
Either way, I do think it is somehow being set up... I kind of surprised how they started to meet other participants, as they are kind of far-related. Fourth can see Ninth because she is counted as criminal, Ninth can see First and Second through him because she was stalking Twelfth; but the rest is kind of.. like being set up indeed. XD