Kunou has a big crush on Issei after he protected her in Volume 9 of the Light Novels. However, their initial relationship was hostility as she confused Issei to be the one who abducted her mother. Once this misunderstanding was cleared up Issei not only accepted her apology but also offered to help save her mother, subsequently she began to admire him.
Ophis and Kunou are noted to having a rather good friendship, with Kunou calling her Phis, albeit due to not knowing her true name, and Kunou creating a shrine for Ophis to be treated as the Dragon God.
Yasaka is Kunou's mother, whom she loves dearly.