Kanae Suidō, originally Kanae Isshiki, served as a compassionate elementary school teacher deeply engaged in volunteer work and driven by a fervent commitment to justice. After marrying Gori Suidō, mayor of the 24th Ward, she raised two children, Koki and Asumi. Her unwavering dedication to preserving societal harmony motivated her pivotal role in creating the KANAE system—a large-scale complex computer designed to enforce peace and order as her final endeavor.

Years before the series’ events, Kanae passed away under unclear circumstances. Her legacy endured through the KANAE system, which later sparked turmoil when it was discovered that her daughter Asumi’s brain had been covertly integrated as its core component by Gori and Sakiko Tsuzuragawa, a chief researcher devoted to Kanae’s principles. Though intended to honor her vision, this act breached ethical boundaries and distorted her conception of justice.

Kanae’s impact resonated among allies such as Kuchikiri (0th), a former partner turned system opponent, and Sakiko, who pursued Kanae’s goals despite escalating moral dilemmas. Her community-centric ethos also materialized in projects like the Takara Food Bank, institutionalizing surplus food distribution for disadvantaged children in the 24th Ward.

Tensions with Gori over governance philosophies and project ethics strained their marriage prior to her death. Nevertheless, Kanae’s ideals persisted as a moral compass for the ward, influencing pivotal decisions and conflicts long after her demise.