Class Monitor, Stay Away!

"By the way, you said you wrote me a letter once. What kind of letter was it? A challenge? An apology?" "...Neither. I wrote an essay explaining just how slow on the uptake and stupid you are." I love you, and you haven't the slightest idea. It's so frustrating. A short story about a cheerful, sunny high school girl and the top student class president she's grown up with, constantly battling each other. Theme: