1girl, afloat, bikini, bikini_under_clothes, black_hair, blue_eyes, breasts, cleavage, from_above, huge_breasts, long_hair, looking_at_viewer, lying, navel, on_back, open_clothes, open_shirt, partially_submerged, school_uniform, serafuku, shirt, side-tie_bikini, solo, string_bikini, swimsuit, swimsuit_under_clothes, water, white_bikini