Mei Mei (冥めい冥めい, Mei Mei?) is a supporting character in the Jujutsu Kaisen series. She is a grade 1 jujutsu sorcerer who works independently and only in exchange for money.
Xu xiao and you are dorm mates, because the birth rate is declining, so the school requires 18-year-olds and above to have babies to increase the birth rate.