A medium shot, side-view anime illustration of a petite young girl with fair skin running across a schoolyard. She has longish short black hair, sharp and cool-looking eyes behind glasses, and is wearing small ear piercings, her face lit up with a bright, energetic smile. She is dressed in a red track and field uniform with the number "21" printed on the chest, the sleeveless design revealing her underarms. Her body is glistening with beads of sweat from the exertion, and her five-fingered hands are clenched into fists as she pumps her arms in a dynamic running motion. The background is a sunny schoolyard with a dirt track and distant school buildings under a clear sky. The lighting is bright and natural, with high-contrast highlights and saturated colors, conveying a refreshing and spirited athletic atmosphere.