Very happy to say this one felt a bit less formulaic, and Hokuto did indeed get her own story, entirely separate from her brother and Seishirou. Loved the parts about what it means to be a "foreigner," with Hokuto insisting that there is no such thing. There's no land called "foreign," so everyone is from somewhere and shouldn't be lumped into a faceless "other" group.
This series is all about how Tokyo is a metropolis bent on destruction, but CLAMP always works on bringing out the humanity and areas of beauty even in the midst of a city toppling from grace. It's important that Subaru is the heart of this story, because it's his kind heart that has the power to transform those around him.
Seishirou remains mysterious, but at this point, he appears to be sticking close to Subaru in order to protect him - from his own kindness, sometimes. But Subaru's grandmother, the former head of their clan, doesn't know anything about their relationship, and it's clear things would not go well if she did.
This volume only had two stories: Hokuto's, and one with a girl from Subaru's childhood. A little surprised, actually, at the pacing, because we don't really seem to be heading anywhere specific yet, and I didn't think this was a particularly long series? With only 7 volumes, things will have to pick up and shift dramatically pretty soon.
One of the themes so far is about recognizing the humanity inherent in various groups of people. Even if what they're doing seems like it's harming someone else, everyone has their reasons for doing things, and those being harmed may also be causing their own harm to others. Each of them recognizes this but approaches it in different ways.
Subaru believes that he can bring out the blameless good in anyone he's interacting with. Seishirou believes that everyone is ultimately to blame, no one is particularly good, and humans need love and dreams to keep on going in a world they'd otherwise be devastated by. And Hokuto thinks that everyone has their own bits of good and bad, but she'll choose to stand by those she's decided to care about. So I suppose that's who she is in this story - she's not just a jokester third wheel, but a good balance to two pretty opposed worldviews.