Despite everything going on, Maseki seems pretty down with whatever class reps got going on. She's probably one of the few people who would listen and believe the class rep.
This lie was just stupid anyways. Even if Teru is alright now he will fly off the handle if a rumor of her fucking him went about. On top of that it doesn't explain jack shit about the fact that she is missing and last seen at his house.
There's so much shit happening
He could simply use the MiB gun in the vice prez and she would forgot this problem
but now the girl thinks that he killed karagaki "for the best interest for the class" (????????)
and now alien girl will zap her atoms out of existence