2girls, black_cardigan, black_footwear, black_sailor_collar, black_skirt, blue_cardigan, blue_hair, blush, cardigan, cellphone, cherry_blossoms, closed_mouth, collarbone, day, fang, holding, holding_phone, kotonoha_akane, kotonoha_aoi, long_hair, multiple_girls, neckerchief, one_eye_closed, open_cardigan, open_clothes, open_mouth, outdoors, petals, phone, pink_hair, pleated_skirt, purple_neckerchief, red_eyes, sailor_collar, school_uniform, serafuku, shoes, siblings, sisters, skirt, smartphone, smile, socks, spring_(season), stairs, voiceroid, white_socks, yamamomo_(plank)