1girl, against_glass, arm_up, black_hair, breasts, casual_one-piece_swimsuit, covered_navel, feet_out_of_frame, frilled_one-piece_swimsuit, frills, hibike!_euphonium, kousaka_reina, long_hair, looking_at_viewer, medium_breasts, natme24, one-piece_swimsuit, purple_eyes, reflection, solo, swimsuit, white_one-piece_swimsuit