1girl, armpits, arms_up, ass, bare_shoulders, blue_one-piece_swimsuit, blush, breasts, cleavage, collarbone, covered_navel, cropped_arms, hair_bun, ichikawa_hinana, idolmaster, idolmaster_shiny_colors, kakeru_(fujiwara_kakeru), large_breasts, light_brown_hair, looking_at_viewer, multiple_views, one-piece_swimsuit, single_hair_bun, sweatdrop, swimsuit