Iyo Oki is a large second-year high school student standing 185cm tall. She has a beautiful face with long black hair and sharp, slanted eyes. She has a complex about her body being too large for a woman and is always timid. Being introverted and shy, she is poor at talking to others. Because of her large build, sharp eyes, and social awkwardness, people around her think she is a "scary person," but in reality, she wants to be friends with everyone. She has a best friend in another class named Seina Chii.