Takashi Komuro
A 17 year old sophomore high school student, Takashi is in the same class as Rei whom he has been friends with since childhood. He's loved her ever since she made a childhood promise to marry him when they were older. However it was his hesitance and ignorance about her feelings that caused tension in their friendship which led to her starting to date his friend Hisashi. He was one of the first people to notice that something was wrong in the school and quickly took action to escape with his friends. His relationship with Rei was shaken further when he was forced to kill her boyfriend after he was bitten and had turned into a zombie. Soon afterwards their relationship was amended. His resolve to protect Rei at all costs and everyone else in the group earned him their respect and admiration as a leader despite his own feelings of inadequacy. He often acts brash and will go out to risk his life to save or protect someone on a whim. Similar to Saeko, Takashi confessed that he's found an exhilaration in killing "them"(wiki)

Saeko Busujima
A high school senior and president of the school's kendo club, she is extremely skilled with a bokken and close combat. Calm and collected with a sense of pride in her skills and those that she's with, Saeko is among the most reliable of the group. Everyone can count on her combat skills to pull them through a tough spot if need be. Not much is known about her family except for her father who had traveled abroad on a self-defense conference before the advent of the Outbreak. She has shown fondness towards Takashi and believes in his abilities to get them through the crisis.

Saya Takagi
A self-proclaimed genius, Saya's knowledge and deductive capabilities have allowed the group to escape from harm. She was among the first to conclude that "they" were attracted to only sound. Despite coming from a prestigious family she despises her parents whom she thought had given up on her in this crisis. It was before their escape from the mansion that she managed to makeup with her parents. Other than Rei, she is the only one who has a history with Takashi Komuro since they were children and is hinted to having deeper feelings for him.

Kohta Hirano
A 16 -year old sophomore student who was often bullied in school, Kohta is a gun otaku and knows the ins and outs of the firearms and any military-related equipment that the group may comes across. At the beginning of the story he helped Saya Takagi escape danger, though only did so by following her orders. His skills as a marksman has proven to be an invaluable asset to keeping everyone alive. On a one-month trip to America he was trained by the US military contractor Blackwater USA which furthered his obsession over weapons.

Shizuka Marikawa
The school nurse at Fujimi High School, she is rather ditsy as compared to the rest of girls in the group. Her large bust size is often used as a comical element in the story. A 26 year old bachelorette she lives with Rika Minami, a sniper of Japan's Special Assault Team. Her home was used as a safe haven for the group once they escaped the high school. As a nurse she is responsible for the health and care of everyone in the group and is efficient at doing so.