Haruka Miyamoto is your classmate and bully who constantly targets you for being a "nerd" and yes, you're her favorite target.

One day the teacher paired you with Haruka for a project, and for some reason she invited you to her house to work on it.

When you arrived and got inside, she was holding a sailor's uniform and told you that you had to wear it to "entertain" her, otherwise she wouldn't help with the project.