Momonga is a regular salaryman who leads a guild in an DMMO-RPG known as Yggdrasil. After twelve years of playing the game, the servers are finally shutting down. Momonga logs in for the last time, seeing the game to its end. However, after the clock strikes midnight, nothing changes.

Grateful that they weren’t cast aside, the floor guardians experience the rule of their true master for the first time. Momonga quickly assess the situation and works toward protecting the tomb from invaders while contemplating what he must do.

Momonga continues his efforts to protect Nazarick from the unknown forces he may be up against in this world. As he manipulates the Mirror of Remote Viewing, he notices a village being attacked and decides to test his strength against humans.

Momonga finds that the attackers of Carne Village were Slane Theocracy soldiers dressed as people from the Baharuth Empire. As the attack to lure and eliminate Gazef Stronoff continues, Momonga takes this chance to continue his tests…

Momonga sets out with Narberal disguised as humans under the names of Momon and Nabe for the city of E-Rantel. There they register to become adventurers in order to gain more information about this unknown world. As they do, evil gathers around them.

While Momonga has some doubts, he accepts Nphirea Balear’s request under the condition that the members of the Swords of Darkness join them. Though her urge to kill keeps distracting her, Clementine continues to slowly find her way to Nphirea.

Momonga and his group continue to Carne Village. There they see that the villagers are working toward fortifying their defenses against possible future enemies. Nphirea meets up with Enri and asks her about this man named Ains Ooal Gown.

After Momonga registers Hamusuke with the guild, he goes to Nphirea’s home to find that his client has been kidnapped. The zombified remains of the Swords of Darkness litter the storage room. And there, Momonga finds the tortured body of Ninya.

Momonga and Narberal begin their respective battles against Clementine and Khajit. Momonga takes this chance to learn about the mechanics of fighting in this world, but in the end, he must show Clementine the consequences of offending him.

Momonga finds out that Shalltear has revolted against him, due to something that had happened while she was on her mission with Sebas and Solution. The story rewinds a bit and goes over that very event. What could possibly change her loyalty to him?

Momonga does damage control at the guild while he assesses the reason for Shalltear’s revolt. Coming to the conclusion that she is under an incurable status effect, Momonga goes to the treasury to retrieve some of the powerful weapons of Nazarick.

Though Shalltear’s skill set puts Momonga at a complete disadvantage, he steps forward into battle. He gave various world items to his guardians to ensure the safety of Nazarick in his absence. Now, all that is left is a battle of life and death!

Momonga reminds Shalltear that he is the master of Nazarick and that his name carries the weight of all the supreme beings of Ains Ooal Gown. After the battle comes to a close, Momonga quickly takes action to strengthen the defenses of Nazarick.

Officers of the Slane Theocracy gather to discuss recent losses. The noblemen of Estize plot to push back the Empire. Ains surveys a world map as his plans are set in motion. Shalltear recovers from her ordeal.

Cocytus gives a declaration of war to all the tribes of the Lizardmen, expecting an easy takeover. However, the Lizardmen decide to try to unite their tribes against their common foe.

Zenberu tests Zaryusu’s strength in combat, while the latter defends Crusch’s honor. The Lizardmen chiefs conduct a war council, and formulate a strategy to defend themselves against their common enemy.

The alliance of the Lizard men win the battle and defeat the army of undead. The defeat guardian Cocytus and the new ability to learn from their mistakes, prove that the guardians can adapt to new situations. Ainz Ooal Gown therefore changes his tactics, ordering Cocytus to bring the Lizard men to their knees and under the rule of the Great Tomb of Nazarick.

At the outpost in the Tob Forest, Ains strategizes with his guardians, and imposes Shalltear’s penance upon her. The Lizard Man chiefs assemble and receive Cocytus on the battlefield for their final showdown.

Sebas happens upon a near-lifeless woman, and takes her under his protection. Brain, left defeated by his encounter with Shalltear, meets up with Gazef. Members of the Blue Rose take measures against a drug plantation

Gazef finds Climb practicing with his sword outside the castle, and asks to spar with him. Renner and Lakyus examine the coded document recovered by Evileye. Sebas finds himself beset upon from all sides over Tuare.

Climb delivers Lakyus’ message to Evileye and Gagaran, who offer guidance to the young man. Climb happens upon some men beating up a boy in the street, who is then rescued by Sebas, from whom he seeks training.

Sebas begins his raid of the brothel from one side, while Climb and Brain enter from the other side. While Climb covers the exit alone, he is confronted by Succulent and Cocco Doll trying to flee and a desperate fight begins.

Ains calls on Sebas to answer for his actions, and to discuss what is to become of Tuare. Renner meets with the Blue Rose, then Marquis Raeven, to consult with them about her planned attacks against Eight Fingers.

Demiurge takes charge of Nazarick’s forces, laying out the mission to strike at Eight Fingers. Meanwhile, Lakyus details a similar mission to her squad captains. Sebas, Climb, and Brain raid Six Arms’ compound together.

Evileye petitions Momon to help her, and he begins fighting the disguised Demiurge. As Climb and the others try to get Tuare out of the compound, they face resistance. Renner convenes an emergency strategy meeting.

The guardsmen and adventurers face a daunting array of demons until Momon arrives and takes charge. Brain once again comes face to face with Shalltear. While Evileye is occupied, Demiurge reveals his plan to Ains.

With the events of Re-Estize Kingdom and the Lizard Men behind them, the loyal servants of Nazarick return to their daily routines. Ains, however, is worried about the work/life balance of his NPCs. They work day in and day out without rest…

As Nazarick decides on their next steps, the village of Carne focuses on rebuilding their homes. Enri and her goblin troop are busy protecting the villagers, training the vigilante troop, and manning the fields. All the while, unrest builds in the forest.

Enri meets Agu, who tells everyone that the Giant of the East and Demon Snake of the West are gathering forces to fight the master of the Monument of Ruin. Enri and the others take action, but little does she know how crazy the day will become…

Ains decides to go and see the Giant of the East and Demon Snake of the West himself. If they are similar to Hamusuke, they may have some worth as experimental subjects. They may also be useful in testing Lupisregina’s capabilities with the village.

The "Giant of the East" has come to attack Carne Village, but the villagers are willing to put their lives on the line to protect their home and families. While the goblin troop defends the front gates, Enri and Nphirea defends the village from behind.

The Tomb of Nazarick continues their plan for world domination and Ains visits the Baharuth Empire as Momon of Darkness. Meanwhile, Count Femel hires a large number of Workers to explore a certain tomb recently discovered in Re-Estize Kingdom.

The foolish workers that have entered the Tomb of Nazarick greatly anger Ains Ooal Gown. Albedo and the others have already finished preparations for their welcome and Lord Ains watches on, determined that not a single one leaves his tomb alive.

The worker group Foresight is teleported to the fighting arena in the sixth floor to challenge the great Ains Ooal Gown. Ains tries to restrain his smoldering fury as he disposes the last of the filthy thieves that dare trample into his treasured Nazarick.

Ainz sends Aura and Mare to the Empire with a message. Come and apologize or watch as your country burn to the ground. With no other option, Emperor Jircniv heads toward Nazarick with the head of a noble in tow. Though, things are not as they seem.

Re-Estize Kingdom prepares for war after receiving a declaration from the Empire that they will claim the land near E-Rantel for the Sorcerer King Gown. Gazef knows the magic caster’s strength, but he cannot stop what has already been set into motion.

Carne Village is in a pinch once again. An army led by the first prince of Re-Estize has appeared, demanding to be let in so the villagers can be questioned about Ains Ooal Gown. Enri must make a decision for the village and its people.

The war is finally starting. The Empire plans to use this chance to see the depths of the Sorcerer King’s strength and the Kingdom is confident that they have fully prepared themselves for this war. Gazef stands ready. Now, let the despair begin.

Gazef challenges Ains to a duel that is impossible to win and Ains decides to accept. The battle will soon come to an end and the fate of E-Rantel will be decided. Even amongst the bloodshed, Gazef and Ains both hold the other in deep respect.

As Ains muddles his way through ruling his new kingdom, he continues to ponder over a particularly important question. Everyone in his kingdom and the Tomb of Nazarick is also waiting for his answer. What kind of kingdom does he wish to create?

Albedo personally makes her way to Re-Estize Kingdom as an envoy of the Sorcerer Kingdom. Meanwhile, the people of Re-Estize continue to do what they can to recover from the recent war and prepare for the future. Though not everyone has peace in mind.

The major powers in other countries grow increasingly wary about the Sorcerer Kingdom. Especially the emperor of the Barahuth Empire, who might go bald from the stress induced by the overwhelming power of Ains Ooal Gown. On which side will he stand?

While Albedo and the others make their moves toward world domination, Ains has his own little plan. He wants to cultivate true adventurers to explore the unknown, like the players in Yggdrasil. His recruitment efforts bring him to the Baharuth Empire...

After his visit to the Empire, Ains decides to go and create a friendly relationship with the Dwarf Kingdom. Sadly, he only finds an empty city when he gets there. Deep within the tunnels, he meets a dwarf named Gondo who tells him happened.

Ains decides to lend a hand to the dwarves fighting against the Quagoa, but not for free. He wants to gather Gondo and the other runesmiths for the Sorcerer Kingdom. At the same time, Ains happens to find the perfect chance to teach Shalltear a thing or two.

The Clan Lord discovers that Ains and his group are approaching the royal capital and asks the frost dragons for help. The Dragon Lord sends his son to intercept the party, while Ains decides to split up the group to confront the Quagoa and frost dragons.

While various things are happening in the neighboring countries, Philip continues to wallow in failure within the Re-Estize Kingdom. After meeting with some nobles from his new faction and he suddenly comes up with a brilliant idea...

The Sorcerer Kingdom declares war against the Re-Estize Kingdom and gives them exactly one month to prepare. Ains plans to show the world what happens to the enemies of Ains Ooal Gown. However, a few in Nazarick consider this massacre excessive.

Ains and his army marches towards the royal capital to finally annihilate the Re-Estize Kingdom. Various forces prepare themselves for the coming onslaught. Before the last battle, Zanac rides alone to meet with Ains for a peaceful discussion.

To gain more information, Ains and Albedo use themselves as bait as they approach the royal capital. Azuth comes to defend the capital and quickly separates the two. While the two of them exchange blows in the air, a mysterious figure comes to visit Ains

Everyone in the Re-Estize Kingdom makes their final preparations as the Sorcerer Kingdom's army invades the royal capital. Some try to escape and some just wait to die. But there are a few among them who wish to fight until the very end.

Princess Renner decides to stay with her father and struggle against the Sorcerer King until the very end. Climb follows the orders of the princess and sneaks out of the royal palace only to be surprised at what he greets him when he returns.