Was there anything left to write? One thing. Tadano had endured so much from his classmates and it was her fault. And she made him listen to all of her worries!
It would end now. She wouldn't be a burden to a nice guy like him. Erase these silly thoughts and start on a clean slate. On her own. With an apology.
So she wrote. Five minutes passed. He didn't seem to understand her intent. No matter. She wrote her goodbye and went for the door.
A sound made her stop. The sound of chalk scratching on blackboard.