Yoshioka Yuiko (Nagano Mei) is in bed with a cold soon after she enters high school. She receives a phone call from her class prefect Matsubara-kun. His kind voice over the phone makes her heart pound. But when she attends school the next day and tries to meet Matsubara-kun, she discovers a mysterious guy who wears a paper bag over his head. This is the start of Yuiko’s slightly peculiar, heart-thumping high school life.