So, Random Question Time, do you think Noriko is "real" or not?
There's been a few times where Sensei has alluded to her feeling too perfect to be real, but what really makes me suspicious is her apparently being a naturally pink haired humanoid:
Which could just be how this universe works, but as far as I recall, she's the only character with unnatural hair that has been confirmed to be natural (besides perhaps her sister based off context).
We've also been advised that Niki might be a shapeshifter:
So, both the Nakayamas might not be "real".