Who's the Girl? [spoilers]
Here, I'm referring to the mysterious girl that appears in book 9 story α.
Rumors say that she possibly is a slider from a parallel world.
Assuming that's true, who do you think her "parallel" in the current world?
Well, I myself have 2 theories about her based on the conversation with Kyon on the phone. It's either Yoshimura Miyoko (Miyokichi) or Kyon's sister.
So, what do you think?
Here's the clue:
"But it is alright. I am only planning to say hi to you. Your younger sister is so cute! I want a sister just like her! Arithmetic drills~...... Hehe, so cute."
The underlined phrase is exactly what Kyon's sister says whenever she asks his assistance for math homework!
"Ah, Kyon-kun, you have to help me with my homework after you get out of the bath. Arith~matic~ drill~~ nn~~"
One who knows that must be close to Kyon's sister or is Kyon's sister herself!