Meiko Shiraki is the Vice President of Hachimitsu Academy's Underground Student Council. She is a tall, voluptuous woman who is almost always seen wearing glasses and her tight-fitting school uniform, which struggles to contain her ample assets. As a guard of the school prison, she is strict, dominant, and openly sadistic, taking immense pleasure in punishing the male students under her watch. She often carries a riding crop and has a teasing, condescending demeanor, humming cheerfully while on patrol.