Unless there's some other place where her name is mentioned, I'm guessing that her name is supposed to be "Nakakouji", and not split up into first/last name.
You can find that anywhere!Well, yeah.So you are considering Minato-san your rival, Kasumi?Ah.Kurosawa.She totally considers Minato her rival.Kasumi doesn't care if she's the ace of the softball club or something.Kasumin is in the judo club after all.But on the tatami mats, Kasumi is definitely stronger!She's just a girl who's a little good at sports.Huh!?She's great, isn't she?Someone's obviously been pampered too much when they were in middle school.Anyway.Rival?Which part?Minato-san is kind and cool...