Dropping off paperwork to the Tower everyday makes her, if not a known quantity, then at the very least a face familiar enough to be allowed to walk through the lobby unimpeded. It’s more than she ought to expect, really–there are many cogs in this administrative machine and she is the most minuscule of a part.
Sneaking into her classroom is far more difficult, even if that is where she belongs.
Yanagi-sensei spots her immediately. Unsurprising, given he is a chuunin, and she’s not sneaking in to fool him so much as she’s trying not to be noticed or interrupt his lesson.
Beyond a tilt of his head, he doesn’t remark on her entrance though, which she is grateful for. Some students, when they’re tardy, get punished–standing outside with buckets of water in each hand or being tied upside down until their faces turn bright red–though generally they’re also troublemakers for other reasons.
Tetsuki tries not to make trouble; she can’t afford it.
Still, being late is not without drawbacks: her preferred seat, four rows back and nearest to the window, has been taken by someone else, and she catches looks from her classmates who already have wandering eyes.
She slinks into the nearest available seat–second row, closer to the wall, unfortunately–and doesn’t recognize the person beside her.
She’s taken aback for a moment, a flash of mortification–has she entered the wrong room? Is this the wrong class entirely?–before logic asserts itself.
No, Yanagi-sensei wouldn’t do that to her, and she did spot classmates she knows from her original cursory glance around the room; it’s just this one in particular that she doesn’t know.
The boy beside her gives a baffled look in return, before shifting his attention back to their sensei.
Following his lead, Tetsuki does the same.
She can solve the mystery later.