1girl, ass, bikini, black_hair, blue_background, blue_sky, breasts, butt_crack, heart, idolmaster, idolmaster_million_live!, leaning_forward, long_hair, looking_at_viewer, looking_back, milliani, red_eyes, sideboob, sky, smile, striped, striped_bikini, sweat, swimsuit, takayama_sayoko, tongue, tongue_out, visor_cap, volleyball_net