The former prime minister, Noah Gibun, is revealed to be an outsider. Like Diablo, she's a player of the MMORPG who came to this world. In order to defeat the Emperor and his overwhelming power, Noah recruits Diablo and the young Demon Lord Klem into her ranks. At first, Diablo's fear of social interaction made him refuse, but eventually... “I admit it. You are the leader.” “Thank you, Diablo. I will do everything to answer the trust you’ve placed in me.” Diablo finally decides to fight in a party...?! 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!

Diablo, Rem, and Shera have arrived at the Bridge of Ulug only to discover that an army of Fallen are marching towards Faltra! This should be no problem for a powerful Demon Lord like Diablo...except that Diablo is actually Takuma, a video game addict who's in way over his head. Will Diablo's stats hold up in a real-life battle?

 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!" Will Diablo's great magic annihilate the Church!?  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!

'" Takuma was just another awkward gamer, but a twist of fate sees him summoned to another world--in the body of a demon lord! And no one''s more terrified of the prospect than Takuma himself. He may have power, but he''s in way over his head. So he decides to pretend to be the monster he looks like, and accidentally winds up with a pair of gorgeous slaves: a voluptuous elf and cat girl. It''s not what any of them wanted, but they''ll have to figure out how to work together if they want to survive! "'

SWEPT AWAY In order to cure the Marked Death Disease, Diablo must raid his own dungeon to retrieve a healing talisman from his treasure trove. But when lowly adventurer Horn is carried off by a raging underground river, Diablo must leap in after to save him! Meanwhile, Rem, Shera, and Lumachina continue on as planned, only to encounter a Black Dragon!

All her life, Rem has carried the soul of the demon lord Krebskulm inside of her, terrified of letting such an evil loose on the world. But now a mysterious Fallen has told Diablo, Rem, and Shera about a ritual that could free Rem. The catch is that it means letting Krebskulm free as well... Can Diablo, a fake demon lord from the ordinary world, take on the real deal?!

After defeating the Grand Devil Belphegor, the Demon Lord returns from Hellion Territory to his home-away-from-home, the Village of Rabbi. There he summons yet another advisor, this time to handle the maintenance and management of the village. He had hoped to finally make space for some quality time with the friends he’s made in this world, but his well-deserved R&R is cut short when one of the four major political factions in Holylight sparks civil unrest.

For the first time since waking up in his favorite MMO, Diablo is up against an opponent that's actually as strong as he is! Galford is a mighty warrior and the governor of Faltra, but instead of keeping the peace, he's been trying to start a war with the elf kingdom! If Diablo can't defeat Galford in battle, then the whole world's in trouble!

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?! This is the fifth volume of the adventure of an earth-shakingly powerful Demon Lord (or at least someone who acts like one) taking on another world!

After overcoming Nevel’s harrowing cold, Lapter’s spies, and an unexpected betrayal, Princess Rosemary von Velfalt successfully recovers the stone containing the demon lord and returns home to face her father. Since her accomplishments have proven her worth, the king fulfills his promise and offers her the right to choose her own partner...but gives her only six months to seal the deal! Now comes possibly the biggest hurdle of her life—winning Sir Leonhart’s heart. On top of that, there’s the problem of the demon lord in the stone, and only Hidden World’s heroine, the shrine maiden, has the power to truly remove this evil from the world. With the summoning of the shrine maiden imminent, can Rosemary permanently break her flag for arranged marriage in a mere half year’s time? Or will someone else steal away Sir Leonhart, along with her freedom?