Mai Zenin is a grade 3 sorceress and a second-year student at Kyoto Jujutsu High, a member of the Zenin clan, younger twin sister of Maki Zenin and daughter of Ogi Zenin. Like her twin sister Maki Zenin, Mai was mistreated by the Zenin clan growing up only for being a girl with little talent for jujutsu. Mai was content with living under their thumb as a servant and would rather do chores than fight. In contrast, Maki wanted to spite the clan and work as a sorcerer.