The tenth episode of the first season. In the tenth episode of the first season of the anime "OVERLORD", Shalltear, who was controlled by a mysterious organization, used her lamprey form to fight the Bone King, but she still lost miserably. "Overlord" is a fantasy adventure novel written by Japanese light novelist Kane Maruyama. It was originally serialized on the Internet and later adapted into a Bunko light novel. The work was published on July 30, 2012.