Akiho Nogizaka is the wife of Gentō Nogizaka and mother to Haruka and Mika Nogizaka. She presents a quiet, intellectual demeanor but wields significant strength to counter her husband's strict tendencies, earning her the family designation "Nogizaka house's ultimate weapon." Her strikingly youthful appearance often causes initial confusion, leading observers to mistake her for Haruka's older sister or cousin. Professionally, she holds the position of principal at an unnamed cooking school.

She actively supports Haruka's relationship with Yūto Ayase, frequently observing their interactions to monitor their emotional development while enforcing strict expectations for Haruka's academic performance and responsibilities. Her influence over Gentō manifests decisively during critical family conflicts, such as physically subduing him to protect Haruka's otaku interests from his disapproval.

In the series' concluding narrative arc, she collaborates with Gentō to orchestrate an elaborate test of Yūto and Haruka's commitment. This involves staging a forced marriage scenario for Haruka to evaluate Yūto's determination to protect their relationship, culminating in her approval after witnessing their resolve during the confrontation.