1girl, ako_(blue_archive), bell, blue_archive, blue_eyes, blue_hair, blush, breasts, collar, cowbell, hair_between_eyes, hairband, holding, holding_pen, large_breasts, long_hair, long_sleeves, looking_at_viewer, lying, neck_bell, ninebell, on_back, pen, red_ribbon, ribbon, sideboob, sideless_outfit, sideless_shirt, skirt, solo, thighhighs