So much drama! This is quickly careening towards a scenario in which everybody loses and nobody is happy.
The side characters were my favorite this episode. First, we have Rumi's basketball friend that offers some stellar advice to Rumi and rightly calls her a big dumb idiot.
Then, we have the most cultured of gentlemen, Professor Moriwaki helping out both Jun and Naori with some sage words of advice (even if it boiled down to nobody can fix this except you).
Finally, I think its nice that this series calls out the lack of communication as the root cause for all this drama and these misunderstandings in the first place. If Jun and Rumi were more open and honest with their feelings, we wouldn't be in this mess.
Just a reminder to tell that special someone in your life how you feel about them!