Harry and Ron watched on with wide eyes as Hermione flipped through her huge, old book frantically, while Mayumi just looked bored.
"Here! I knew it! I kne-" Hermione paused mid-sentence and blinked, a small piece of paper, clearly torn out from a notebook, fluttered to the ground, with a familiar script-y handwriting on it. Mayumi took one look at it and walked away with an oddly rapid pace, Harry picked it up, and read it out loud.
"Told ya, Baka." They blinked for a moment, then across them, Hermione seethed.
"MAYUMI!"
The girl flees.