2girls, alternate_costume, arms_behind_head, arms_up, ball, beach, beach_umbrella, beachball, bikini, blonde_hair, blue_hair, blush, closed_eyes, copyright_name, copyright_notice, day, eyewear_on_head, flandre_scarlet, flandre_scarlet_(vampire's_sister_prepared_for_splashes_and_sunlight), holding, holding_ball, multiple_girls, navel, one_eye_closed, open_mouth, outdoors, red_eyes, red_nails, remilia_scarlet, remilia_scarlet_(vampire_prepared_for_splashes_and_sunlight), ruhika, short_hair, siblings, sisters, smile, sunglasses, swimsuit, touhou, touhou_lost_word, umbrella, watermark, white-framed_eyewear, white_bikini, wings