Kazane Shishidō, the eldest of the five Shishido sisters, administers the Shishido Foundation estate and provides strategic leadership for the Enigma Alliance's operations against the Nervalist faction. She manages communications within the family's inner circle, maintaining a consistently sovereign and worldly demeanor honed by coordinating actions and controlling complex situations.

Her background includes inheriting Kagura's "second sight" and possessing a natural aptitude for business strategy. Despite these advantages, her leadership capabilities face significant challenges in family governance, particularly concerning younger sisters Akiha and Nami. This deficiency contributes to adverse outcomes for both siblings: Akiha's life enters limbo, while Nami embarks on a self-destructive path. Kazane's attempt to arrange a marriage for Akiha directly triggers the latter's flight, inadvertently leading to Akiha's encounter with the artificial intelligence Leopard.

Throughout the conflict against Nerval, Kazane's strategic plans prove vulnerable when confronted by enemy actions or unexpected decisions from allies. Akiha's impulsive rush to protect Imoko nearly compromises the alliance's endgame strategy against Nerval, who had shifted toward seeking coexistence with humanity. In the narrative's climax, Kazane collaborates with Kagura to explain the significance of "The Girl Who Leapt Through Space" prophecy to Akiha, culminating in the directive to destroy Leopard upon the emergence of his malevolent alter ego, Panther.

Physically, Kazane possesses light blonde hair, green eyes, and stands 1.66 meters tall, weighing 51 kilograms. Her birthday is February 17, and her blood type is A. A citizen of the Kirkwood colony cluster, she embodies a composed and authoritative presence in her duties.