1girl, o, bare_arms, bare_shoulders, black_one-piece_swimsuit, black_pantyhose, ceiling_light, competition_swimsuit, dated, exercise, exercise_machine, eyelashes, flat_chest, gym, high_ponytail, indoors, kobayashi_chisato, light_blush, long_hair, looking_at_viewer, one-piece_swimsuit, original, pantyhose, pantyhose_under_swimsuit, parted_lips, purple_hair, signature, solo, sweat, swimsuit, treadmill