1boy, 1girl, armpits, arms_behind_head, barefoot, breasts, closed_mouth, couch, crop_top, feet, full_body, greyscale, kotoyama, looking_at_viewer, monochrome, nanakusa_nazuna_(yofukashi_no_uta), short_hair, shorts, simple_background, sitting, white_background, yamori_kou, yofukashi_no_uta