Nozomi Hidaka mothers Yumemi Hidaka and her younger son Chikara, sharing a marriage with Shigeru Hidaka. Together, they uphold a stable household while closely observing their children's development. Her parenting occasionally adopts strictness, born from concern for her family's welfare. She acts with clear intentions centered on her children's growth and stability. When Yumemi grapples with distress over seeing floating islands in the sky, Nozomi anchors her with a grounded home presence, though she initially deflects Yumemi's questions about responsibility by redirecting focus toward academics.

During a Kino River incident involving Yumemi's friend Suzume, the school contacts Nozomi, compelling her swift arrival at the scene. This illustrates her attentiveness to Yumemi's school life and social ties. Later, when the Heavenly World becomes globally visible, the phenomenon sparks personal reflection for Nozomi, driving her to revisit her own past. Her marital bond with Shigeru remains profoundly strong, serving as a steadfast foundation for the family dynamic.