蘭堂 奈津美

A mathematics teacher at Himejo Girls' Academy and an alumnus of the academy who always wears revealing clothes. Before graduating, she was also a member of the Six Maidens. In contrast to her showy appearance, Natsumi is a kind and friendly woman who is particularly popular with the male teachers.

She is also a heavy drinker as well as a ruthless sadist who loves making both men and women submit to her.