In which a quiet girl trying to get through her last year of high school by avoiding all conflict in her school and sitting in the back. She didn't expect a new math teacher who also became her new volleyball coach which made her plans to have a chill last year into chaos. #1 in Fanfiction

So basically, the chorus teacher just had a baby, and it's the middle of the year, so a new substitute (also known as Harry) comes to be the sub for the rest of the year (4 months)