A single 26-year old woman and the school nurse at Fujimi High School. At the beginning of the story, Shizuka was saved by Saeko. She is rather ditsy as compared to the rest of girls. Her large bust size is often used as a comical element in the story. She is close friends with Rika Minani, a sniper of Japan's Special Assault Team. Their home was used as a safe haven for the group after they escaped the high school. Despite being the only adult in the group, she is emotionally fragile and doesn't know what will become of her life. Like the rest of the main characters, Shizuka worries that she will never see her family or friends again.
Even though she's emotionally fragile, Shizuka feels a responsibility to "chaperon" the kids. As a nurse and the only adult in the group, she is responsible for the health of everyone in the group. Although she is still studying to be a full-fledged doctor, Shizuka has shown incredible medical knowledge. She was even able to bring Kohta to his senses after he was forced to kill Asami Nakaoka. She is the only in the group able to drive a car, even a bus and a Humvee.