No, bad. No harems. They're just more cool people being added to the list of folks Nasa has helped in the past before he met the love of his life.
So, I'm going to go out on a limb and say that Nakiri is probably borderline ace or aro, considering her stated attitude towards romance.. But Nasa's bluntness here may make her consider start looking for her guy that might be able to spark that kind of devotion in her.
i mean, Nasa sounds like he was basically ace/aro before seeing Tsukasa and his entire world turned upside down. Nakiri probably just needs to find a guy that can do that for her in the same way.