Akiho Nogizaka is the wife of Gentō Nogizaka and mother to Haruka and Mika. She holds the position of principal at a cooking school. Despite being a mother of two, she possesses a remarkably youthful and elegant appearance, leading Yūto Ayase to initially mistake her for Haruka's older sister or cousin; this youthful look remains consistent.

Within her family, Akiho presents a quiet and intellectual demeanor, contrasting with her husband's authoritarian nature. However, she wields significant influence in household matters, often overcoming Gentō's decisions through implied strength or persuasion. This effectiveness earns her the informal title of the "Nogizaka house's ultimate weapon" among family and close associates. She oversees Haruka's studies, enforcing strict academic expectations.

Akiho actively observes and supports Haruka's developing relationship with Yūto Ayase. She frequently participates in or encourages activities that allow her to monitor their interactions, including joining others in covertly observing the couple's outings. Her approval of their bond becomes evident during critical family conflicts, particularly when Gentō opposes Haruka's otaku hobbies. She intervenes decisively to counter her husband's objections, resolving disputes and facilitating acceptance of Haruka's interests. Her characterization centers on balancing maternal support with household authority.