Rule 34 Dev - 10s 4girls absurdres black_eyes black_hair book brown_eyes brown_hair hibike!_euphonium highres katou_hazuki kawashima_sapphire kousaka_reina long_hair multiple_girls neckerchief official_art oumae_kumiko red_neckerchief school_uniform serafuku short_hair takahashi_mariko thighhighs window|6169360743