Height 170 cm (5'7") Mai Zenin is the younger twin sister of Maki Zenin. Mai is a grade 3 sorcerer and a second-year at Kyoto Jujutsu Technical High School. As a child, Mai always relied on Maki since she was afraid of Cursed Spirits.

Spoiler

Because Mai and Maki are monozygotic twins, their strength is considerably limited to one another. Monozygotic twins are considered as a single individual in the Jujutsu world and are a sign of bad omen.

Spoiler

In chapter 149, Mai decides to sacrifice herself in order to make Maki stronger.