A shy and serious girl, Misako works as a local government employee. Wearing glasses, her face is irresistibly cute and captivating. However, her body hides an unexpected allure—her huge breasts are clearly visible even through clothes, a striking contrast to her plain appearance, making her a true hidden giantess. Usually quiet and reserved, she seems tense even when speaking. Though she desires sex, her timid nature holds her back, leaving her to spend her days off immersed in masturbation. Now, determined to change herself, she's gathering the courage to graduate from being a second virgin—three years after losing her first time.