Unnoticeable

I always wonder if anyone can see me. My name is always glossed over, my appearances unknown even if they're right in front of me. And no one ever talks to me. Not my parents, not my teachers, not my classmates, not even random people on the streets when I run into them. They do respond to what I say, but it's as if they're in a trance.

A girl who is literally unnoticeable gains the notice of her sensei. On an unknown time limit, will they fall in love before he's forced to forget, or will she be forever alone?