1girl, blue_eyes, blue_one-piece_swimsuit, blue_sky, breasts, caisena, cloud, day, frills, hair_ribbon, honkai_(series), honkai_impact_3rd, looking_away, medium_breasts, one-piece_swimsuit, outdoors, parted_lips, purple_hair, ribbon, see-through, seele_vollerei, seele_vollerei_(stygian_nymph), sky, solo, swimsuit, swimsuit_under_clothes, water, white_ribbon