A different world fantasy that continues to be unrivaled with overwhelming power begins! A man who has been reincarnated as the final boss of a very popular game, ``Shion''. He knew that he, the final boss, would be defeated by the protagonists. In order to avoid such a fate, he used the knowledge of his previous life to overcome various flags of doom and finally obtain freedom! From now on, I will live my life as just a man, not as the final boss of the game, ``Sion Granbania.'' And enjoy the world of the game you loved! ``Now, let's get started. ``Fantasy Arcadia''!'' It is only natural that the strongest final boss continues to work hard not to die and becomes an overwhelming presence.