2girls, alternate_costume, bare_shoulders, black_hair, blonde_hair, blush, breasts, dress, full_body, gloves, hair_ornament, hairclip, half-siblings, high_heels, itou_kaori, legs_together, long_hair, looking_at_viewer, merry_christmas, multiple_girls, one_eye_closed, open_mouth, sakurajima_mai, santa_dress, seishun_buta_yarou, siblings, side_ponytail, sisters, smile, toyohama_nodoka