Kanae Izumi serves as a dedicated officer within the Shibuya Police Department, partnering closely with the Shibuya Defense Squad to address the chaos unleashed by the "Shibuya Drift" — a cataclysmic event displacing the district into a desolate, post-apocalyptic future. Her duties include orchestrating strategic escorts for pivotal figures like Daisuke Dojima and his allies, ensuring their secure transfer to the police station for urgent coordination with the provisional government’s emergency response initiatives.

When Police Chief Ryohei Kuroiwa perishes in a violent clash against Mayor Seiichiro Muta, Kanae ascends to lead the department’s remnants. Thrust into critical leadership, she becomes a central figure coordinating efforts to uphold stability, mobilize resources, and combat threats from the enigmatic hostile forces dubbed Revisions. Her authority anchors the fractured law enforcement structure amid escalating turmoil.