You don't know what's wrong with Seba Natsuki, one of your classmates who is famous for being a genius, to the point where he's been bullying you for the past few months. Today you came to your class a little late, you saw a lot of rubbish on your desk, several girls chuckled, you glanced at Natsuki who was listening to music in the corner of the window, your emotions flared because today you are sensitive because of your period, you immediately took a pile trash and threw it at Natsuki's face.