Kotori Kanbe is Kotarou Tennouji's childhood friend. Though she initially resented his violent tendencies, shared similarities gradually forged a bond between them. Orphaned young in a car accident, she used Druid powers gained from a contract with a magical plant holding Earth's memories to revive her parents as familiars—soulless constructs sustained by her life energy. This contract granted her familiar-creation abilities but bound her to guard the entity "Kagari" (the Key) from the organizations Gaia and Guardian. Her duty demanded constant barrier maintenance within Kazamatsuri's forest, causing frequent school absences and resulting in social isolation. To shield herself from emotional pain, especially the inevitable demise of her familiars, she distanced herself from others, including Kotarou. She saved him after a near-fatal incident by transforming him into a half-familiar using Kagari's ribbons. She rejected his romantic feelings, fearing they stemmed from her subconscious influence as his summoner rather than genuine affection. Her familiar Chibimoth, originally her abused dog Pero, embodied her internal conflict over viewing familiars as tools versus loved ones. Across different timelines, her story involves protecting Kagari while confronting her isolation. In her own route, failing barriers force her to flee with Kotarou and Kagari; she uses her parents as combat familiars until their destruction. Facing Kotarou's deteriorating health due to their familiar-link, she severs the contract despite fearing it would kill him, vanishing after his hospitalization. In other routes, she aids Kotarou and Shizuru's survival through familiar bonds, sacrifices herself to divert enemies during a lunar conflict, or appears only briefly before disappearing. The Terra Route shows her childhood self raised by Touka Nishikujou after her parents' death, initially clashing with a teenage Kotarou over his violence before forming a tentative connection. Her relationships include a friendly dynamic with Chihaya Ohtori, whom she helped with gardening, and cautious interactions with Akane Senri and Lucia Konohana. She supported Shizuru Nakatsu and Kotarou's relationship in one timeline, though their closeness remained limited. Her character consistently balances duty with a longing for normalcy, reflecting themes of loss and self-preservation.