Overlord Novel Volume 1 is written by Kugane Maruyama with illustrations by So-bin.

The once popular game "Yggdrasil" was supposed to shut down that day. Everyone was supposed to be logged out automatically. But the players who stayed online past the moment the servers went quiet found themselves transported to a game world made real. Leading them is Momonga--a man whose love of games in the real world brought him only loneliness, now a skeletal sorcerer. The legends of Momonga and his guild begin here!

Overlord Novel Volume 2 is written by Kugane Maruyama with illustrations by So-bin.

It has been a week since Momonga logged in to his favorite RPG one last time and stranded himself there. Now he leads his guild as the Ainz Ooal Gown overlord. Finding himself in dire need of better information, he travels disguised as an adventurer to the walled city of E-Rantel, with Narberal the battle maid at his side. The pair accept a mission to retrieve medicinal herbs, making for a forest said to be the home of a great and wise beast. 

But the sinister influence of a fanatical cabal approaches E-Rantel, and the armor-clad Ainz will face both a ruthless warrior and a legion of the undead!

Overlord Novel Volume 3 is written by Kugane Maruyama with illustrations by So-bin.

Lord Ainz has made great progress moonlighting as the indomitable hero Momon, but what should be a moment of triumph is shattered by news of rebellion. He vows to find out what has happened and to defend the honor of his guild and home Ainz Ooal Gown.

Overlord Novel Volume 4 is written by Kugane Maruyama with illustrations by So-bin.

An army of death approaches a peaceful lizardman village an army of undead deployed by Nazarick. Its commander is the Sovereign of the Frozen River Cocytus. The lizardman coalition shall face the Great Tomb of Nazarick. The weak are meat the strong shall eat in the merciless world that awaits in Volume 4.

Overlord Novel Volume 5 is written by Kugane Maruyama with illustrations by So-bin.

In the Re-Estize Kingdom, there is a sinister organization that holds sway over the criminal underworld called the Eight Fingers. At the same time, there are three men in the country who work hard to steadfastedly pursue their goals. Sebas is busy infiltrating the capital to conduct intelligence gathering efforts on Lord Ainz's orders. Climb is constantly striving to better his weak self so as to better serve his master, the "Golden" Princess. And Brain returns to the same capital while struggling to find a new reason to live after being utterly crushed by an unbelievable power. As the Kingdom is slowly fraying at the edges, these three men will fight for their beliefs as they face the corrupt Eight Fingers crime syndicate!