Rule 34 Dev - 10s 1girl anime_coloring aqua_neckerchief blush brown_eyes brown_hair capitan_(tsyoujo) chair chalkboard female_focus hibike!_euphonium highres instrument looking_at_viewer nagase_riko neckerchief pleated_skirt sailor_collar school_uniform serafuku short_hair sitting skirt smile solo tile_floor tiles tuba|7998983109