1girl, aruman, ass, bad_pixiv_id, barefoot, black_hair, blue_one-piece_swimsuit, blurry, blurry_background, blush, breasts, brown_eyes, competition_school_swimsuit, dark-skinned_female, dark_skin, earclip, feet, from_behind, full_body, grin, hair_ornament, hairclip, hand_on_own_ass, ijiranaide_nagatoro-san, long_hair, looking_at_viewer, lying, nagatoro_hayase, on_side, one-piece_swimsuit, pool, school_swimsuit, small_breasts, smile, soles, solo, swimsuit, teeth, toes