Mai Asahina attends Hakujō Academy as a classmate of Yūto Ayase and Haruka Nogizaka. She exhibits a quiet and reserved nature, often contrasting her more boisterous friends. Her traditionally graceful and kind demeanor contributes to her popularity with male students, resulting in her nomination for a school pageant.

As vice-chairman of the school's naginatajutsu club, Mai demonstrates proficiency in the martial art. She maintains a close friendship with Shiina Amamiya and Ryōko Sawamura, frequently seen with them as a trio. Within this group, Mai provides a calm counterbalance to Ryōko's energetic personality.

Primarily appearing in cameo roles during the first anime season, Mai gains more prominence in the second season, *Purezza*. Here, she and Ryōko discover Shiina's romantic feelings for Yūto and actively encourage her pursuits, influencing the evolving relationship dynamics. Her established traits and relationships remain consistent throughout the series, films, OVAs, and related media, maintaining her role as a supporting figure within the main cast's social circle.