The Nocturnal Blackboard Eraser [Weekly Short-Short Note]

"I... I couldn't forgive it. The blackboard."
"The blackboard?"

The "Nocturnal Blackboard Eraser" that goes around erasing blackboards night after night—that rumor spread throughout the school, and the phenomenon was actually confirmed.
That was when I, a young teacher patrolling the school late at night, encountered a female student.

"I was finally on duty with the boy I like... but when I came to school that day, someone had drawn a love umbrella around our names on the blackboard..."

I see. So she was teased, and her relationship was ruined.
That must have been painful, but—

"If only this thing didn't exist...!"

Enraged, she unleashed a straight punch with a magnificent stance that put her whole body into it.

"Stop, the blackboard is innocent!"
"If you get in my way, I'll erase you too, teacher!"

I flinched. I was intimidated by the power of a heartbroken maiden who could crack a blackboard with a single blow.

"That's enough."

Just then.
Something jumped out in front of her and scattered chalk dust with a puff.

"...! My eyes..."
"I understand how you feel, young lady—but unfortunately, I can't stay silent when my name is being tarnished."

It was the Nocturnal Blackboard Eraser!