Kagari Hinase is the older sister of Hotaru Hinase, the protagonist of the anime A Condition Called Love. Her background is that of a university student who is a member of a campus club, and during her high school years, she supported herself with a part-time job.

In terms of personality, Kagari is characterized by a long-standing lack of personal interest in romantic relationships, as she has never had a boyfriend nor shown any inclination toward love. Despite this personal detachment from romance, she takes on a supportive role in her sister's life, primarily by offering advice to Hotaru on navigating her own romantic situations and feelings. Her motivation stems from her position as the elder sibling, acting as a grounded and experienced confidante for Hotaru, even if her own emotional experiences differ.

Her primary and most significant role in the story is defined by this relationship with her younger sister. Kagari serves as a sounding board and a source of guidance, providing a perspective that is caring but potentially distanced from the intense emotions of first love that Hotaru experiences. Her key relationship is exclusively with Hotaru, as no other major connections with characters are detailed. Her development is subtle, as her character is largely static; she is an observer and advisor rather than a protagonist undergoing a personal romantic journey. Her notable ability lies not in any physical or special skill, but in her capacity to offer practical, level-headed counsel on matters of the heart, a role she fulfills despite her own confessed lack of romantic experience.