1girl, asashin_(asn), bare_shoulders, bikini, black_hair, blush, breasts, brown_eyes, collarbone, idolmaster, idolmaster_shiny_colors, long_hair, looking_at_viewer, mayuzumi_fuyuko, medium_breasts, navel, pool, poolside, red_bikini, solo, swimsuit, thighs, two_side_up, wading, wet