1girl, arm_support, blush, breasts, collarbone, dark_red_hair, hand_on_own_leg, long_hair, looking_down, love_live!, love_live!_sunshine!!, old_school_swimsuit, one-piece_swimsuit, orange_eyes, parted_lips, red_hair, sakurauchi_riko, school_swimsuit, simple_background, sitting, small_breasts, solo, swimsuit, tsmkn26, white_background, white_one-piece_swimsuit