Confined to a room for 13 years, Mashiro Kamitsuka spends her days tending to the divine beings residing within her hair. As the shrine maiden of the Kamitsuka clan, she is required to meticulously care for her long hair and serve as a sanctuary for deities who have lost their strength. Despite her patient waiting for the deities to depart, none have left since her confinement began. One morning, a mysterious voice guides her outdoors, where her relatives attempt to coax her back inside. Refusing to return, Mashiro voices her wish aloud, causing the fire god Hinokagutsuchi, "Hinokagu," to appear. Aided by Hinokagu's powers and her loyal servant Hayate, Mashiro escapes the family estate and takes refuge in a dilapidated shrine. Although Mashiro, Hayate, and Hinokagu strive to live a normal life together, the Kamitsuka clan refuses to leave them in peace and continues to escalate their methods of punishment. However, these new circumstances are not entirely detrimental to the trio. By breaking free from familial bonds, Mashiro gradually uncovers more about her role as the Kamitsuka shrine maiden, the deep-seated secrets within her family, and the troubled past of the god who altered her life.