That´s exactly my big problem right now ... WHY are we in this, as you call it, mini-arc? I want to follow Ayanokouji as he continues to figure out the school´s system and mystery´s and helps his class to progress.
Sure, they might throw in a twist at the end of this mini-arc that leads to the above, but so far there´s nothing but a filler-ish sidestory.