4girls, aketa_mikoto, bare_legs, barefoot, beach, beach_umbrella, bikini, black_bikini, black_hair, blonde_hair, blush, breasts, brown_hair, casual_one-piece_swimsuit, cover, cover_page, doujin_cover, green_hair, hair_bun, hair_ornament, hairpin, idolmaster, idolmaster_shiny_colors, ikaruga_luca, indian_style, innertube, looking_at_another, looking_at_viewer, looking_to_the_side, mat, mismatched_bikini, multicolored_hair, multiple_girls, nanakusa_hazuki, nanakusa_nichika, one-piece_swimsuit, romaji_text, shade, shhis_(idolmaster), single_hair_bun, sitting, small_breasts, streaked_hair, surprised, swimsuit, umbrella, uouokuma, white_one-piece_swimsuit, wide-eyed