1girl, asakura_ageha, ass, back_cutout, bare_arms, bare_shoulders, blonde_hair, blue_one-piece_swimsuit, blush, brown_eyes, butterfly_hair_ornament, closed_mouth, clothing_cutout, commentary_request, competition_swimsuit, from_behind, hair_ornament, looking_at_viewer, looking_back, medium_hair, one-piece_swimsuit, outdoors, ryouma_(galley), sitting, smile, solo, swimsuit, thighs, water, yumeochi_-_yume_de_bokura_wa_koi_ni_ochiru