1girl, black_hair, black_thighhighs, buruma, closed_mouth, collarbone, dated, gradient_background, gym_uniform, hibike!_euphonium, kousaka_reina, long_sleeves, looking_at_viewer, nii_manabu, pink_background, purple_eyes, red_buruma, short_hair, signature, solo, thigh_gap, thighhighs, thighs