Chihaya Ohtori arrives as a transfer student, her airheaded demeanor belying extraordinary strength tied to her contract with the familiar Sakuya. Her vibrant orange hair flaunts wing-shaped clips, paired with a brown suit and green-checkered skirt, though she occasionally dons a white dress with blue accents at her mansion. Socially inexperienced and accident-prone, she masks emotions behind defensiveness, especially when teased by Kotarou Tennouji—a friction rooted in their chaotic first meeting involving a shattered box and a tree collision.

Born in a village dedicated to crafting familiars, her life fractured when Guardian destroyed her home, killing her parents. Cornered during the assault, she summoned Sakuya from a splintered branch, binding them for life. This tragedy propelled her to Gaia, where she became a summoner researching familiars, her sheltered existence leaving her naive and easily amused by simple humor.

Her journey intertwines with the Supernatural Investigation Club, where gradual bonds with Kotarou erode her prickly exterior. A pivotal garden renovation crisis sees Kotarou shielding her, sparking reluctant trust. Joint training sessions with Sakuya and Kotarou nurture her reliance on others, climaxing when she confesses her feelings after he risks his life defending her from foes Midou and Touka. Her route ends with her leaving Gaia to pursue normalcy, torn between past obligations and present connections.

Crossover depictions amplify her quirks comedically—such as "Chihaya Rolling," a gag where she tumbles from Okinawa to Siberia—retaining her core clumsiness and strength while prioritizing lighthearted ensemble antics over narrative depth.