Now that's an outlandish set-up. Using even one of these two elements would be enough for its own manga, but throwing muteness and telepathy into one mix... works surprisingly well.
My only question is whether telepathy girl can't turn her mind reading off... which would be hell on earth in a school setting. But her radar seems pretty focused on mute girl. If she can decide to listen and to whom, that might imply she actually wants to hear mute girl's thoughts.
Either way, cute!