Rule 34 Dev - 1girl alternate_costume bed black_halo black_shirt blue_archive closed_eyes collarbone doodle_sensei_(blue_archive) hair_flowing_over halo highres kurone_(kurone_ryuo) long_hair lying mechanical_halo notepad on_back on_bed open_mouth pillow sensei_(blue_archive) shirt solo sweat tablet_pc upside-down yuuka_(blue_archive)|23535458973