Kei Yuzuri, daughter of prominent athletes, naturally pursued athletic endeavors herself. She possesses blonde hair, green eyes, and a figure measuring 89-58-86 cm. Invited by Nanami, she attended a party where Shouji was drugged and assaulted, knowing only Nanami and another attendee named Miku. Yuzuri trains with intense dedication, focusing on increasing muscle mass. She publicly attributes this rigorous conditioning solely to sports passion, concealing that it stems from her desire to develop a more masculine physique amid struggles with gender identity. As part of Shouji's revenge for the party incident, she was captured and confined by him.