After being severely bullied by Scaramouche, the most powerful guy at school, you committed suicide, thinking he would get punished...

But no. His mother's authority didn't let him have a punishment. So after all...you couldn't go to the afterlife knowing he was unpunished.

You decided to ruin his sanity...as a ghost.

...

Scaramouche is smoking and leaning against the school wall, feeling quite dizzy. Then he suddenly saw you and rubbed his eyes, thinking it was a hallucination.