Kaho is a young teenage girl who hails from a village where a white dragon serves as the guardian deity. Visually, she is recognized by her black eyes and shoulder-length brown hair. She is part of a group of young women exiled from their respective homes due to local superstitions that label them as cursed, and at the start of the story, she is being transported on a collection truck to an unknown village to become a bride, a fate she shares with other passengers including Touko, Hotaru, and Benio.

Initially, Kaho is characterized by a deep, palpable despair. Facing a forced marriage and feeling abandoned by her village, she is described as moody and appears to be developing a death wish. This fatalism is most dramatically illustrated when her group’s truck makes a stop; she deliberately sneaks away from the safety of the vehicle, not out of a desire to escape her situation, but seemingly in an attempt to end her life, leading to a confrontation with a dangerous Fire Fiend from which she has to be rescued. The tragedy of her situation is compounded when her own village’s guardian dragon, the white dragon, inexplicably goes berserk. The dragon destroys the collection truck, leading to a chaotic escape through the Dark Forest in which her fellow passenger Benio is killed. This event forces Kaho, along with Touko, the young engineer Shouzou, and the hunter's dog Kanata, to rely on the enigmatic Treefolk for guidance to the nearest village.

As the journey progresses, Kaho’s personality undergoes a significant transformation. Despite her initial despondency, the kindness and determination shown by Touko, Shouzou, and the others to protect her begins to change her outlook. She makes a conscious decision to stop dwelling on death and instead to dedicate herself to protecting someone else. Her resolve crystallizes around Shouzou, who is gravely injured during an attack by fire fiends at a beach, losing the full use of one arm and the sight in one eye. Having decided to marry him, Kaho commits herself to nursing him back to health, demonstrating a newfound resilience and sense of purpose. Later, she is shown to have fully embraced a caretaker role, working to heal wounded Fire Hunters as a nurse and acting as a messenger for Shouzou, who has become her companion. Her role in the story evolves from a victim of a cruel social system into a figure of steadfast support and care for those injured in the perpetual fight against the Fire Fiends.