1girl, ahoge, bare shoulders, birthday, black shirt, black skirt, border, chibi, chibi inset, closed mouth, dated, detached sleeves, drill hair, grey background, grid background, hands up, happy birthday, headphones, index finger raised, jitome, light blush, looking at viewer, multiple views, musical note, notice lines, open mouth, outline, outside border, own hands clasped, own hands together, pleated skirt, red eyes, red hair, shirt, skirt, sleeveless, sleeveless shirt, smile, sparkle, twin drills, upper body, white border, white outline