kusaka souji, yotsuba (sister princess), sister princess, 00s, 1girl, :o, bikini, blue bikini, blue ribbon, blush, breasts, brown eyes, brown hair, clenched hands, female focus, flag print, floral print, hair ornament, hair ribbon, hairclip, jacket, leg up, long sleeves, looking at viewer, navel, open clothes, open jacket, outline, print bikini, red eyes, red hair, ribbon, shoes, simple background, sleeves past wrists, small breasts, sneakers, socks, solo, swimsuit, two side up, union jack, unzipped, white background, white socks