While playing the MMORPG Cross Reverie, Sakamoto Takuma possessed such overwhelming power that he was nicknamed the Demon King by other players. One day, he is called to a world similar to this game. In front of him were two girls arguing about who exactly was “Summoner!”, and were going to use Subjugation Magic on him. That’s just the “Magic Reflection” ability working! And these girls became slaves! Takuma was confused. He may be a strong magician, but he does not have communication skills. Panicking, he used the manner of speech he used in the game - the Demon King's style: “Are you saying that I'm amazing? Well, of course, I, Diablo, am the one... who is feared as the Demon King! >