"I admit it. You are the leader." "Thank you, Diablo. I will do everything to answer the trust you've placed in me." As it just so turns out, the former prime minister Noah Gibun is an outsider-a Cross Reverie player who was pulled into this world-just like Diablo! She desperately wants to defeat the Gelmed Empire, but due to their overwhelming power, she has to recruit Diablo and the young Demon Lord Klem. The antisocial Diablo wants no part of this! Will he be able to deal with fighting alongside a party for the first time ever? Will he finally overcome his social anxiety? This is the fourteenth volume of the adventures of an earth-shakingly powerful Demon Lord (or at least someone who acts like one) taking on another world!

CHAOS IN THE CATHEDRAL With Zircon Tower safe, Diablo and his crew turn their attention to the corrupt Cardinal Council. But danger lurks beyond the church walls, as Diablo realizes once again that not even powerful magic and enchanted gear can level up his ability to talk to girls.

The beginning of a tale of adventure with an earth-shakingly powerful Demon Lord (or at least someone who acts like one) taking on another world! In the MMORPG Cross Reverie, Takuma Sakamoto is so powerful that he is lauded as the "Demon Lord" by other players. One day, he is summoned to a world outside his own-- but with the same appearance he had in the game! There, he meets two girls who both proclaim themselves to be his Summoner. They perform an Enslavement Ritual to turn him into their Summon... but that's when Takuma's passive ability "Magic Reflection" activates! Instead, it is the girls who become enslaved! Though Takuma may be the strongest Sorcerer there is, he has no idea how to talk with other people. It is here he makes his choice: to act based on his persona from the game! "Amazing? But of course... I am Diablo, the being known and feared as the Demon Lord!"

"Heheheh... You claim the title of Demon Overlord and yet do not know of me? Your ignorance knows no bounds!" The MMORPG Cross Reverie's top player, Takuma Sakamoto, is summoned to another world where he's forced to play the part of the Demon Lord Diablo! The next opponent standing in his way is the Demon Overlord! Sensing he might not win this time, Diablo visits the swordmaster to develop his skills as a warrior to break the limit of the races. Just as he does, the Demon Lord's army marches on the citadel city of Faltra! The adventurer Emile and the governor Galford take up their blades to do battle, but the strength of the enemy exceeds all their expectations!

Will Diablo's great magic annihilate the Church!? Lumachina has set out to reform the corrupted Church! Choosing to help her, Diablo finally makes his way to the Royal Capital. Even though a great battle against the Paladins looms ahead, Diablo is certain of his victory, for the new equipment he's gained from his Treasure Vault is overwhelmingly powerful by this world's standards. But before the battle can commence, the Church's believers stand in Diablo's way, powerless and helpless. Not wishing to fight them, Lumachina is imprisoned by the Church and falsely blamed for crimes she didn't even commit! The High Priest, the pacifist she is, accepts even this unjust treatment, but Diablo can't just sit idly and let that pass."You fools who cannot even tell friend apart from foe-I have no reason to forgive your existences any longer!"This is the sixth volume of the adventure of an earth-shakingly powerful Demon Lord (or at least someone who acts like one) taking on another world!

"Acting out the part of a Demon Lord, Diablo accepted a quest from the King of Lyferia. However, after befriending the kobolds he was meant to dispatch, he faces off against the Kingdom of Lyferia.But that situation is changed in the space of one night, because of a shocking decleration of war from the Empire of Gelmed!The enemy lays waste to a citadel city with overwhelmingly powerful Magimatic Sols, conquering it. Diablo, on the other hand, runs into an entirely different kind of crisis."Erm... Diablo... I, uhm, saw it.""""Huh?"""I saw what you... did in the courtyard with Solami... last night."This is the twelfth volume of the adventures of an earth-shakingly powerful Demon Lord (or at least someone who acts like one) taking on another world! The start of a huge plot twist!"

"Endeavor in my name. I'll allow it!""Let's go on an adventure then-to the Viridian Cathedral!" MMORPG Cross Reverie's top player, Takuma Sakamoto, is summoned to another world where he's forced to play the part of his in-game character, Demon Lord Diablo! Diablo has successfully saved Faltra in his greatest battle yet, but there's no rest for the weary! A summons arrives from the Kingdom of Lyferia, demanding Diablo make an audience with the king. However, Diablo also learns the wedding ring he gave Rem actually forms a pair with Shera's! Diablo teams up with Faltra's guildmaster, Sylvie, to arrange an official substitute.

The second volume of an adventure with an earth-shakingly powerful Demon Lord (or at least someone who acts like one) taking on another world! After being summoned to another world that resembled the video game Cross Reverie, Takuma Sakamoto accidentally ended up with two girls as his slaves: the Pantherian, Rem, and the Elf, Shera. Takuma, under the guise of his screenname Diablo, came to this world a powerful Sorcerer, just like his avatar in the game. Along with the two girls and Emile, a devilishly handsome Warrior, they managed to protect the town of Faltra from the looming threat of invasion by the malevolent Fallen. But that peace they brought upon the town did not last long. The Kingdom of Greenwood, a country of Elves, makes a troubling demand: if their princess isn't returned to her rightful home within the time allotted, then the Kingdom will declare war on Faltra— And it's up to Diablo and the others to prevent a war with the Elves!

The third volume of an adventure with an earth-shakingly powerful Demon Lord (or at least someone who acts like one) taking on another world! After being summoned to another world that looks almost exactly like the MMORPG he once played, Takuma Sakamoto now spends his days going on adventures with Rem Galleau, the black-furred Pantherian, and Shera L. Greenwood, the Elf princess, both of whom accidentally became enslaved... to him!?One day, he is suddenly approached by the Fallen, Edelgard, with a request: Would he help her to undo the seal that keeps the Demon Lord Krebskulm inside Rem?Takuma, under the guise of his in-game character Diablo, hesitates, as he had previously made a promise to Rem to help her defeat Krebskulm- But he pushes through with his Demon Lord role-play and actually agrees!"I will revive the Demon Lord Krebskulm-and defeat them!"Now it's his Demon Lord role-play vs. an actual Demon Lord!

Will Diablo be able to conquer the dungeon he himself created?! The High Priest Lumachina has been afflicted with a curse, and Diablo's only way of saving her is by reclaiming an item he once obtained in the game Cross Reverie. His next challenge: a dungeon that has claimed the lives of many brave adventurers... But his confidence isn't misplaced, for it was he who designed that very dungeon! Even when facing off against a supreme dragon, Diablo never falters, just like a true Demon Lord! "Heh, you think yourself a God with a mere level of 140? Don't make me laugh, you overgrown newt!" At the same time, a Fallen heralding the return of the Demon Lord appears in Zircon Tower...?! Will Diablo be able to conquer the dungeon he himself created to retrieve the cure and make it back to defend Zircon Tower in time?!