1girl, arm_behind_back, bikini, blush, breasts, breasts_apart, brown_hair, collarbone, cropped_legs, groin, idolmaster, idolmaster_million_live!, kasuga_mirai, looking_at_viewer, medium_breasts, navel, one_side_up, oscar_08, pink_bikini, side-tie_bikini_bottom, smile, solo, swimsuit