1girl alternate_hairstyle breasts closed_mouth clothing_cutout copyright_name crop_top greyscale hair_rings highres kotoyama long_hair looking_at_viewer monochrome nanakusa_nazuna_(yofukashi_no_uta) ringed_eyes short_hair simple_background sleeveless sleeveless_turtleneck sleeveless_turtleneck_crop_top solo turtleneck turtleneck_crop_top upper_body yofukashi_no_uta