1girl, ass_visible_through_thighs, bare_arms, bare_legs, bikini, collarbone, flat_chest, from_above, from_behind, grey_bikini, grey_hair, halterneck, hoshino_ruri, innertube, kidou_senkan_nadesico, long_hair, looking_at_viewer, multi-strapped_bikini, navel, open_mouth, ru-ha, solo, swimsuit, thigh_gap, very_long_hair, water, yellow_eyes