1girl, breasts, cleavage, cleavage_cutout, clothing_cutout, dars_(recolors), hair_down, halloween, halloween_costume, long_hair, looking_at_viewer, mature_female, navel, red_eyes, smile, solo, stomach, yahari_ore_no_seishun_lovecome_wa_machigatteiru., yuigahama_yui's_mother