1girl, black_hair, black_thighhighs, brown_shirt, brown_skirt, cloud, feet, foot_out_of_frame, hibike!_euphonium, kitauji_high_school_uniform, kousaka_reina, leg_up, legs, long_hair, midriff_peek, natme24, neckerchief, no_shoes, pleated_skirt, purple_eyes, red_neckerchief, sailor_collar, school_uniform, serafuku, shirt, sitting, sitting_in_window, skirt, solo, stretching, thighhighs, thighs, window, zettai_ryouiki