It's a classroom scene, one of the main characters, I think it's the female protagonist is annoyed or obsessing about something. The female teacher is writing on the blackboard (facing us, the audience) and the female protagonist is just... thinking really intensely with a dark aura. The vibes coming from behind her are freaking her out and it's pretty funny. It happens a couple more times (I think the second time, she's thinking, "I want to go home. T_T"😉 with the last time, the character's issue is resolved, the vibes are now annoying rather than scary.

Sorry about this. It's really bugging me.

Edit: Ok. It was Osuteki Darling. Chapter 5.