Weekly Short-Short Note: The Nocturnal Blackboard Eraser

I am a nocturnal blackboard eraser.
Night after night, I sneak into the school and go around erasing the words written on the blackboards with chalk.
Tomorrow is graduation day for many schools. That is why students draw celebratory illustrations and write messages on the blackboards.
I am going to erase them all.
It would be better if everything, absolutely everything, just disappeared.
It would be better if this whole world, where you no longer exist, just disappeared.
I want to erase everything and return the blackboards to their original state.
That day, I went all around the school, erasing the illustrations the students had worked so hard to draw on the blackboards.
Ahahahaha. Disappear, disappear. Everything, disappear. I will paint over your precious memories and everything else in black. Paint it black!!

…The nocturnal blackboard eraser never realized it. Ironically, by erasing too many words, it had become 'pure white' itself.