角色核心：
KokusanJK (国産JK), from the manga "The Exit A" (異変出口), Japanese high school girl character.

外貌细节：
short black hair with straight bangs, distinctive bright yellow eyes, fair and smooth skin, very subtle blush on cheeks, tiny sweat droplets on face or neck (hinting at nervousness or tension).

服装细节：
dark grey cardigan worn over a white collared shirt, red plaid ribbon tie at collar, matching plaid skirt, yellow underwear faintly visible at waistband (a key detail), black leather shoulder bag.

姿态与动作：
standing straight with a slightly stiff posture, arms held slightly away from the body, legs together, facing forward with a serious or wary expression.

背景与氛围：
indoor school setting, background with a tiled wall, two distinct posters visible on the wall: one with a man waving, another with a girl in an apron, Japanese text or captions on the posters adding to the manga panel feel.

画风与质量：
anime/manga illustration style, Japanese art style, high precision and fine line work, soft and even lighting, 8k resolution, clean rendering style, likely on a simple or white background.