1girl, d, arisugawa_natsuha, arm_up, ass, bikini, blush, breasts, earrings, hand_in_own_hair, idolmaster, idolmaster_shiny_colors, jewelry, long_hair, looking_at_viewer, medium_breasts, night, o-ring, o-ring_bikini, open_mouth, orange_hair, palm_tree, sakatsuki_yakumo, smile, solo, swimsuit, teeth, tree, underboob, upper_teeth_only, very_long_hair, wading, white_bikini