If she holds the phone too close, she'll go deaf from Oobayashi-kun's voice. If she holds it too far away, the speaker won't pick up her voice. Truly the hardest dilemma to be in. Oobayashi-kun however, does not have that kind of problem lol
Komori-san should never trust Oobayashi-kun with her secrets, no matter how small they may be.
"WHAT?! YOU GOT SUZUKA-CHAN A BIRTHDAY PRESENT? I HAVEN'T EVEN BOUGHT MINE YET!!"
I suspect that the male mc is deaf. They should probably get that looked into, particularly as its taken to such an extreme that he is literally harming the hearing of everyone else in class.
While is looks pretty cute in manga, it's very annoying in real life to speak to someone who can't control their volume. My friend is like this, every time he opens his mouth, he makes all living beings in a radius of 1km turn their head.