1girl, ass, beach, bikini, blue_sky, blush, breasts, day, ichikawa_hinana, idolmaster, idolmaster_shiny_colors, koyo_akio, large_breasts, light_brown_hair, looking_at_viewer, looking_back, mismatched_bikini, outdoors, round_teeth, sky, solo, splashing, swimsuit, teeth, twisted_torso, two_side_up, underboob, wavy_hair