1girl, bikini, bikini_skirt, black_bikini, black_hair, border, breasts, cowboy_shot, facing_viewer, grin, hand_up, hibike!_euphonium, high_ponytail, kousaka_reina, long_hair, looking_to_the_side, matarasu_(aaaaaaaaj), medium_breasts, navel, purple_eyes, smile, solo, stomach, swimsuit, thighs, white_border