I have some doubts about the displayed time of the apartment of N&K. They stay up and dine very late. It would feel more natural if the real time was two hours earlier.
If you look at Kira, she appears very tired often. She barely manages to keep her eyes open, or smile back at Nina. Which is a shame really, because when Kira is wake and fresh she laughs a lot and makes jokes too.
But it is a good thing that both Nina and Kira are leaving the house in the morning again. Thats should mean that both are working again, or at least some study. It all was on Kira's shoulders for a while.