Trapped

Marinette and Adrien are close friends but they can't become more than that, mostly because Adrien refuses to see marinette as "more than a friend" and Ladybug won't give Chat a chance. After being fed up with it a new face enters the school on a mission to shed some light on these poor (very) dense teenagers.

And thus for the next week every student was trapped in the school (with permission from faculty) on a superhero hunt

FYI, I don't know if I want lila to exist, so wait and see what happens