The Undead King is the 1st light novel volume in the Overlord Series. It was released on July 30, 2012. It details about Satoru Suzuki, whose game avatar known as Momonga, a player of YGGDRASIL suddenly finds his consciousness trapped in his avatar and all of the NPCs around him begins to gain sentience. He must struggle to find a way to survive this new world.

The Dark Warrior is the 2nd light novel volume in Overlord series, It was released on November 30, 2012. It details about Ainz Ooal Gown as Momon and Narberal Gamma as Nabe and their ascension to fame as adventurers in the Re-Estize Kingdom.

The Bloody Valkyrie is the 3rd light novel volume in Overlord series, It was released on March 30, 2013. It details about Ainz Ooal Gown stopping Shalltear Bloodfallen's rebellion before she cause more problems for his future plans in the New World.

The Lizard Man Heroes is the 4th light novel volume in Overlord series, It was released on July 31, 2013. It details about the Lizardmen trying to save their tribe against the undead forces from total annihilation at the Great Lake.

The Men in the Kingdom is the 5th light novel volume in Overlord series, It was released on December 30, 2013. It details about the first half of the Men in the Kingdom.

The Men in the Kingdom is the 6th light novel volume in Overlord series, It was released on January 31, 2014. It details about the second half of The Men in the Kingdom.

The Invaders of the Large Tomb is the 7th light novel volume in Overlord series, released on August 30, 2014. It details about a certain group of workers who volunteered to explore and investigate a mysterious Large Tomb.

The Two Leaders is the 8th light novel volume in Overlord series, released on December 26, 2014. It details about the side stories of Enri Emmot becoming the new village chief of Carne Village and Ainz Ooal Gown doing his daily life in the Great Tomb of Nazarick.

The Magic Caster of Destroy is the 9th light novel volume in Overlord series. It was released on June 29, 2015. It details about the war between the Kingdom and the Empire is near at its end. Ainz Ooal Gown enters the war and later became known as the Magic Caster, who destroys an army.