1girl, armpits, black_hair, blue_background, blue_one-piece_swimsuit, breasts, brown_eyes, competition_swimsuit, dark-skinned_female, dark_skin, grin, hair_ornament, hairclip, highleg, highleg_swimsuit, ijiranaide_nagatoro-san, long_hair, looking_at_viewer, nagatoro_hayase, one-piece_swimsuit, one_eye_closed, small_breasts, smile, solo, swimsuit, syyn_(syyndev), tan, tanlines