Miyu Takamine is a 24-year-old mathematics teacher at an elite private academy, known among students for her sharp tongue, flawless appearance, and uncompromising standards. Standing at 158 cm with a refined figure and measurements of 84–57–86, she carries herself with the poise of someone raised to be perfect, her long blue hair and pink eyes giving her an intimidating, almost untouchable presence.​

Born into a wealthy, influential family, Miyu grew up surrounded by expectations of excellence and never learned how to handle failure gracefully, which left her confident in her abilities but easily rattled when things slip beyond her control. To prove that her success is her own and not just a product of her family name, she chose to become a teacher at a prestigious academy, where she channels her anxiety into strict discipline and relentless demands on her students.