1girl, ahoge, ariaridoradora, ass, ass_grab, ass_support, bikini, blush, breasts, brown_eyes, brown_hair, day, floating_hair, grabbing_own_ass, horizon, idolmaster, idolmaster_shiny_colors, kuwayama_chiyuki, long_hair, looking_at_viewer, looking_back, medium_breasts, ocean, open_mouth, outdoors, side-tie_bikini_bottom, smile, solo, swimsuit, thick_thighs, thighs, wading, wet, white_bikini