Yamada, a high school student, aims to have sex with 100 men by graduation but is held back by her inexperience and self-consciousness about her body. Her best friend, Miharu, tries to reason with her, but Yamada insists on losing her virginity to another virgin to avoid being hurt or judged. She sets her sights on Takashi Kosuda, a shy photographer, but faces challenges from rivals and her own growing feelings for him.