Wintry moon - S1.E10

Koshiro mentions to Kaname that he is thinking of moving out. She pushes him into doing it right away. Nanoka doesn't want to go home, so she arranges to stay overnight at her friend's house where she watches two normal sisters bicker and laugh. Koshiro and Nanoka make up on the phone. Koshiro announces to the family that he's moving out. Nanoka comes to his room and asks if they can sleep together. He agrees on the condition that they not meet again. She wakes up in the morning alone in an empty room and cries.