Nanase: worst gf ever, or at least a close runner-up.
The girl she's dating asks her for simple things (spend more time together, pay more attention to her, have more sexytime) and she doesn't give her anything. Some things she promises after much nagging, but then she doesn't keep her word. Oh but she expects that her demands be satisfied! "Come root for me at Osaka!" Doesn't she know how expensive that is for a teen?
And she didn't even make some free time to be together after the match. They could have gone to a love hotel, since nobody knows them in Osaka! Actually, after dating for half a year, did they have sex at least once? Honest question. I honestly can't remember.
Seriously, why does she even bother going out with another girl if she's going to treat her like a casual friend who isn't really too close? If I didn't know that this is yuri, I'd think that the big reveal at the end of the manga will be that Nanase is straight and needs a boyfriend.