Mai Tadakusa (只草 舞衣), hailing from Gifu prefecture, attends high school alongside Monaka Yatogame and Kaito Jin. She possesses green eyes and green hair extending to chest length. Her mother is identified as Mione Tadakusa.

Mai forms a core group with Jin, Yatogame, and Yanna Sasatsu. Within this group, she represents perspectives and practices typical of Gifu as they examine and contrast regional cultural norms and dialects across Japan. Her interactions fuel discussions highlighting differences in what constitutes "normal" behavior or customs between regions.

Mai appears consistently across all four seasons of the anime. Her participation involves activities and observations centered on local traditions, school events, and daily life within the Chuukyo area. The narrative focuses on her regional representation and familial connection; specific character-focused storylines or deeper personal background developments beyond these elements are not depicted.