Kizuki Yamada

Kizuki is cautious and strongly attached to the possibility that her family has survived. The message telling her they were evacuated gives her a concrete hope to hold onto amid the uncertainty surrounding the outbreak.

Her constant dust mask is one of her most recognizable habits. She continues wearing it inside the hideout, where the immediate danger of airborne exposure is not established, suggesting how thoroughly precautions have become part of her daily behavior.

Like the other young residents, she participates in a community made up largely of people who had been socially isolated before the disaster. Her concern remains more personal than ideological: reaching or learning about her family matters more to her than the mythology surrounding Kurusu.

Kizuki has no established superhuman abilities or anomalous response to ZQN infection.

She survives within a group that has developed practical anti-ZQN procedures, improvised weapons and defensive routines. Kowashi handles much of the group's practical combat instruction, while Tomabechi supplies weapons and research.

The manga does not establish Kizuki as an exceptional fighter, and her role is better understood as that of a young survivor living under the protection and training structure of the hideout.

Kizuki appears when Takashi reaches Kurusu's base. Alongside Haruki and the group's older residents, she helps reveal that the online movement surrounding Kurusu has become an organized physical community rather than remaining a collection of message-board followers.

Her belief that her family reached an evacuation center gives the nearby school particular importance to her. As the hideout becomes increasingly unsafe, the school and the possibility of other survivors there become part of the group's attempts to determine where they can go next.

Kizuki's circumstances also emphasize how incomplete information remains after the collapse: an email received earlier can become the only evidence someone has that their family may still be waiting elsewhere.

Haruki is Kizuki's classmate and another junior-high-school student living at the hideout.

Takashi Ezaki meets Kizuki after being rescued and brought to the group's base.

Kurusu is the figure around whom the survivor community sheltering Kizuki originally formed.

Kowashi is one of the senior members responsible for the practical survival and combat preparations of the group.