Megumi Hidaka is a fifth-grade student in class 5-2 at an elementary school. She is a supporting character in the series, part of the close circle of friends that includes Ryota Sato, Chika Koizumi, Yuuki Asano, Kazumi Aihara, Natsumi Hirakawa, Koji Imai, and Tsubasa Kawai. Megumi wears glasses and is nearly blind without them, and she is somewhat careless in nature, often easily fooled by her surroundings. She is physically more developed than the other girls in her class, which makes her self-conscious whenever others notice. This self-awareness extends to a persistent worry about her weight, and she makes a conscious effort to keep it at exactly 35 kilograms. In terms of personality, Megumi is reserved, shy, and kind-hearted, with a gentle and calm demeanor. She has a strong sense of responsibility toward her friends and is often the sensible voice that balances the more energetic and impulsive personality of her best friend, Chika Koizumi. Megumi is artistically talented, enjoying drawing, and she is also a capable swimmer. Her role in the story is primarily that of a classmate who participates in the everyday school life and comedic situations that arise within the group. While she does not undergo significant personal change, her consistent traits of modesty, sensitivity about her appearance, and loyalty to her friends remain central to her character throughout the series.