I reeeeaaaaaally hate Nana so much...
I honestly thought she was pretty cute here. I mean, she has always had a hard time understanding her own feelings, and in the past it's caused her (and Youko) a lot of heartbreak, but in this it's obvious that she's trying really hard to figure out how she feels and isn't really being deceptive, or manipulative. Even the kiss that Satomi thought was for a secondary motive (coming to her rescue) was something she chose to do, that she wanted really more for herself.
That aside, Satomi's ex seems REALLY familiar. Is she from something else?