Rule 34 Dev - 10s 4girls black_hair bow_(music) brown_hair day double_bass euphonium hibike!_euphonium highres instrument katou_hazuki kawashima_sapphire kousaka_reina long_hair multiple_girls neckerchief official_art oumae_kumiko red_neckerchief rooftop school_uniform serafuku short_hair sky thighhighs trumpet wavy_hair zettai_ryouiki|5805991386