8.
Nagisa, still ten, learns how to observe even more than they had before.
They observe when they can get away with wearing pants instead of the skirt. They observe when their mother's smile is at its most fake.
They observe when their father's bag is gone and isn't coming back. They think about going. They think about going to the court dates their mother hides in the garbage, which she doesn't hide well. They think about seeing what their parents look like at their worst.
Then Nagisa decides to not go, in that same thought process.
Then the white thing comes and sits on their window sill. And they watch.
Nagisa's head hurts.