1girl bangs blush breasts collarbone commentary dot_nose eyelashes greyscale hair_between_eyes hands_up holding holding_towel idolmaster idolmaster_million_live! kasuga_mirai looking_at_viewer minazuki_tooru monochrome naked_towel onsen partially_submerged short_hair sidelocks sitting small_breasts smile solo steam stone_floor thighs towel wet white_background