He is the world's most powerful Demon King, but no one comes to defeat him, so he decided to infiltrate the hero development organization. (5) Gagaga Books

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Demon Calcifer descends. The large-scale battle which occurred in the fortress city Granden seemed to be settled by the activity of Theodore. However, the eerie monsters and the huge cocoon which appeared from the dimensional gap which occurred in the sky near the west of the fortress city create further confusion. The little Claris who rushed to the scene and the Dragon soldiers who came from Ryuo Province sensed the abnormal situation and temporarily fought together against the monsters. Suddenly, the huge cocoon fell from the sky and changed the situation completely. When General Duras, the great hero who finished the battle in the fortress city, rushed to Claris with his favorite horse, a terrible scene spread before his eyes. On the other hand, Theodore, who was doing the post-processing in the city, also saw the presence of the existence from the dimensional gap and was appalled. It was Satan who suddenly disappeared from the front of them a long time ago. Theodore, who rushed to the old sworn friend without regard for everything, finally revealed his true figure in front of General Duras in order to appease the violent sworn friend.