Hinaku is a central figure in the Dawn chapter of the Phoenix series. She is a young woman from the Kumaso tribe in ancient Japan, living in a village situated near a volcano. Her life is dramatically altered by the arrival of Guzuri, a foreign physician who treats her for a serious illness, specifically a pulmonary disease, using an early form of penicillin made from blue mold. This event saves her life and leads to a strong bond between them.

Following her recovery, Hinaku marries Guzuri. However, the wedding night becomes a scene of profound betrayal when a fleet from the Yamatai kingdom, led by the warrior Sarutahiko, attacks and annihilates her village. It is revealed that Guzuri is a spy for the ambitious Queen Himiko of Yamatai, and his presence was part of a plan to conquer the land in search of the legendary Phoenix, whose blood is said to grant immortality. Hinaku and her younger brother, Nagi, are among the few survivors. While Nagi is taken as a prisoner to Yamatai, Hinaku is left behind on the ravaged island.

Her personality is defined by strength, resilience, and a deep, practical will to survive in the face of overwhelming tragedy. She endures the loss of her entire tribe and the shattering betrayal of her husband from a position of complete powerlessness. Rather than succumbing to despair or revenge, Hinaku chooses to endure her circumstances. Forced to continue living alongside Guzuri due to a massive volcanic eruption that blocks any escape, she makes the difficult decision to build a new life with him. Her primary motivation shifts from tribal loyalty to the continuation of life itself. She comes to believe strongly in the importance of nurturing future generations, seeing children as the only true path to overcoming death and loss. This philosophy is a direct counterpoint to the story’s central obsession with achieving immortality through the Phoenix’s blood.

In the story, Hinaku’s role is that of a matriarch and a survivor who represents the human capacity to rebuild. After the destruction of her home, she and Guzuri start a new family, and she gives birth to a set of quintuplets. Her most significant scene occurs years later when her brother Nagi, now grown and seeking the Phoenix to restore their tribe, finds her. Nagi is deeply disappointed and angry to see her living with the enemy and raising his children. In response, Hinaku argues for her philosophy of peace and procreation, urging him to give up his quest for revenge and instead focus on creating a new future by having children of his own. This moment is central to her development; it is where she fully transforms from a victim of tragedy into a deliberate agent of creation and continuity.

Regarding key relationships, her bond with her brother Nagi is the most emotionally charged. They are separated by the tragedy and grow to embody opposing responses to trauma: Hinaku chooses creation and peace, while Nagi is initially driven by vengeance and a quest for the mythological bird. Her relationship with Guzuri is complex and laden with ambivalence. Although he betrayed her people, he genuinely falls in love with her, and she eventually accepts him as the father of her children, choosing a practical partnership over perpetual hatred.

Beyond her role as a survivor and mother, Hinaku does not possess any supernatural combat abilities. Her strength is entirely emotional and psychological. She is notable for being the recipient of Guzuri’s early medical knowledge, which underscores the theme of progress and healing through science, contrasting with the mystical allure of the Phoenix.