kakari (peehs), hirasawa yui, tainaka ritsu, k-on!, 2girls, birthday, birthday cake, blue ribbon, blue skirt, blush, brown hair, cake, closed mouth, dated, dot nose, food, forehead, hairband, happy birthday, holding, holding plate, hug, multiple girls, neck ribbon, plate, pleated skirt, ribbon, shirt, short hair, simple background, skirt, surprised, white shirt, yellow background, yellow eyes, yellow hairband, yuri