(Just so we're clear, I'm not officially taking these characters. I'll leave the mains like Madoka and Sayaka for either of us to play as needed.)
(Mami's class) Teacher: Sadly she had to move down to another class because of.. family issues. She would have been in our class, but perhaps you can still meet her after class if you wish.
(Madoka's class) Teacher: Alright everyone, I'd like you to welcome our new student. She's a third year moving down to your year from Ojou-sama Academy. Please don't make a big deal out of it or I will send you out.
The door opens and the new student (Kagome) enters
Sayaka: whispers to Madoka I hope she's not like miss Akemi over there...
Madoka: Don't be mean, Sayaka!
She stands in front of the class to introduce herself
New student: (With no emotion in her voice whatsoever) Hello. My name is Kagome Hisa, from Ojou-sama Academy. It's nice to meet you.
(Madoka's) Teacher: Alright then, you can take a seat... Ah, in the middle row, right there.
She silently nods and goes to sit down