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Sakamoto Takuma was a participant in the massively multiplayer online role-playing game (MMORPG) Cross Reverie. Due to his overwhelming strength, the other players in the game dubbed him the Demon King. When he finally makes an appearance in the game, one day he will be transported to another realm. There are two people who say "I am the actual summon master" and they both insist on it. Takuma is subjected to the females' spells that transform people into slaves so that they can summon monsters. Despite this, the strange ability known as "Magic Reflection" is utilized! The girls were the ones that were taken advantage of and made into slaves. Takuma was bewildered. Even though he is the most powerful magician, he is unable to interact with people. While he was in a state of panic, the first words that came out of his mouth were the lines he had used while role-playing the Demon King in the game?! "I'm fantastic you say? Obviously, I am doing so. I am Diablo, the fearsome Demon King!" Raise the curtain for the tale of the Demon King's (acting) adventure that will soon inspire people all over the world and his other world journey, which he undertakes by plunging through it with all of his strength.