Diablo and his companions have saved the Kingdom of Greenwood from the Demon Lord Kardia, long sealed beneath the elven wood. But at the very moment they claim victory, two more overwhelmingly powerful demons appear! To prepare for war with humanity, these demons plan to sacrifice Kardia to their master, the Overlord Modinaram, so as to bring him to a truly terrifying height of power. Diablo is the only thing standing against them...and is it possible he might wind up being appointed king of the elves, despite being a demon himself?

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?

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.

Diablo and his companions arrive at a Dark Elf village, searching for a magic ritual that can extract the soul of the Demon Lord sealed inside of Rem. They succeed in gaining an audience with the village's top-heavy chief, Rafflesia, but there's a problem. Shera is elven royalty, and a deep grudge persists between the elves and dark elves. If Diablo's party is to win Rafflesia's favor, they'll have to fulfill some very tough conditions!

Diablo and company rush to the Greenwood Kingdom, where Shera's father, the king of the elves, has recently passed away. Once they arrive, Shera swiftly becomes the center of attention. Whoever marries her will end up as the next ruler of the kingdom! Unfortunately, Shera's mother has already decided on her preferred fiancé, and he's a frightening ogre of an elf. Just what fate is waiting for the princess of the elves...and is Diablo going to stand for it?!

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!

When Shera's brother Keera tracks down Diablo and the others, he demands that Diablo remove the enslavement spell on Shera so he can take her back to the Elf kingdom. But Shera would rather stay with Diablo and Rem, even if that means staying Diablo's slave. Diablo might not be a real demon lord, but he'll have to act the part if he wants to protect Shera from her own family.