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