asagi yuna, original, highres, 1girl, arm up, back, bikini, black bikini, black ribbon, blush, breasts, eyelashes, frilled bikini, frills, from behind, grey hair, hair between eyes, hair ribbon, halterneck, large breasts, long hair, looking at viewer, looking back, open mouth, pink eyes, ribbon, sideboob, signature, simple background, smile, solo, swimsuit, twintails, upper body, watermark, white background, white hair