1girl, backlighting, blue neckerchief, blue skirt, chair, crossed legs, desk, euphonium, head tilt, instrument, kitauji high school uniform, neckerchief, on chair, open mouth, open window, orange hair, parted bangs, pleated skirt, ponytail, purple eyes, sailor collar, school desk, school uniform, serafuku, short sleeves, sitting, skirt, solo, window