Sadao Maou, the Overlord lives in poverty in a six-tatami mat flat with his two confidants, Shirou Ashiya and Hanzou Urushihara. While Ashiya is lamenting over the tight household finances imposed by the NEET Urushihara, Maou senses a weird presence from the shoe boxes. Meanwhile, Emi Yusa, the Hero, visits Suzuno Kamazuki, a Chief of the Doctrinal Corrections Council, who lives in the room next door to Maou's. Chiho Sasaki, a high school girl…

Alas Ramus, a girl born from an apple, suddenly appears and speaks of Maou as “Papa” and Emi as “Mama”. How did the girl, whose true identity is unknown, know that Maou is Satan, and who sent her to Japan? Although it remains a mystery, the gang decides to protect her at the Overlord's Castle for the time being. However, probably because she misses Emi, she keeps crying at night, so much so that Suzuno can hear her through the walls. Ashiya is…

Maou, Emi and Alas Ramus visit the amusement park. Meanwhile, Ashiya, Chiho and Emi's colleague Rika Suzuki are watching over them. However, while Maou is watching the hero show with Emi and Alas Ramus, a crescent moon emblem appears on Alas Ramus's forehead. As Emi is checking on Alas Ramus's condition, a mysterious woman appears. She holds up a ring on Alas Ramus’s left hand, and she instantly recovers. The woman then tells her that Gabriel…

The true identity of Alas Ramus may be the fragment of Yesod, the world-forming element of Sephiroth, which grows in the tree of Sephiroth. Just as they are thinking about this, Gabriel and the Heavenly Guard Regiment appear to capture Alas Ramus. Thanks to their negotiations, they have one day to fight them. In preparation for this, Maou asks Emi to stay at the Overlord's castle so that they can fight together in case they have to fight. Maou…

After the battle, Alas Ramus fused with Emi's Holy Sword. Meanwhile, due to renovation work, the MgRonald’s Hatagaya branch is to remain closed until mid-August. When Maou returns to the castle, disheartened by the word “closed”, he is informed by his landlord that he must temporarily move out of his flat for repair work. The landlord offers Maou and the others a chance to live in and help out at landlord’s niece's beach house in Choshi...

On the night that Maou and his remnants start living in the beach house run by Amane Oguro, a blanket of fog covers the whole area of Kimigahama. Ashiya sees a large figure in the mist, but it turns out to be a seriously injured demon from the Demon World, Cyclops and a Beast Demonoid. On top of that, the Demon Minister, Camio, who was leading the demons coming to Kimigahama, also appears seriously wounded. Why are there demons in Choshi, and…

Camio says that Amane Oguro is the one who outpowered the demons. Maou and the others meet up with Emi, trying not to let Amane realise their suspicions. There, Camio begins to tell them about the state of the three worlds; the demon realm, the Heaven and Ente Isla, after Maou's departure. The demons of the main faction, who are trying to avenge the Overlord’s supposed death, are searching for the Holy Sword at the instigation of Olba Meyer…

After the flat has finished repairing, Maou and the others return to the Overlord’s Castle. However, with the restaurant he is working at still being renovated, Chiho offers Maou a temporary part-time job. It seems that her grandmother's farm has entered the harvest season, but they are currently short on workers. Maou accepts the offer and heads for Nagano in a car driven by Chiho's mother. They cannot hide their astonishment at the sheer size…

A bear appears in the Sasakis's fields, but Emi slams and defeats it with a single-handed backstrap. The incident is then reported in the newspapers, and Chiho's cousin expresses his gratitude toward Emi. Later, Maou hears from Chiho's uncle about how the Sasakis have expanded their agricultural reach. Maou takes in the story and guesses why the conflict in the Demon World did not stop until he unified it. Also, some thieves appear in the fields.

Emerada Etuva calls to ask if someone called Lailah, who is apparently Emi's mother, is visiting Japan. Emi is upset to find out that her mother is nearby, when she wasn't even sure if she was still alive. Meanwhile, loud voices echo from the Overlord's Castle again. Maou wants to buy a TV with the extra income from his work at the sea and in the mountains. Ashiya is resisting, but Maou proposes to use the bonus points he has saved up to now ...

Ashiya calls Rika for advice, and they, along with Maou and Suzuno, head to an electronics shop. Rika cannot stop her heart from beating when Ashiya makes a casual gesture. Maou notices that Rika has a crush on Ashiya while observing the situation. Meanwhile, Emi is searching for Lailah's location, relying on the light pointed by a Yesod fragment. The light indicates a hospital in Shinjuku. There, Chiho is hospitalized, having fallen into a coma…

The cause of Chiho's coma was the sonar from Raguel, the Watcher. Two signal towers are considered possible locations for the enemy, who is using TV signals. Maou and his team split into two groups in search of Raguel. Emi confronts Gabriel and pushes him to reveal Raguel's location and the reason for his search for Lailah. But what comes out of his mouth is the secret of the birth of Emilia, the Hero born between two different races, human and…

The newly renovated MgRonald's in front of Hatagaya Station has a café on the second floor. Leaving Alas Ramus with Maou, who could not hide his excitement about this, Emi, Suzuno, and Chiho were meeting in an adjoining room at the Demon King's Castle. Although Emi calls it girls' talk, Ashiya finds the term strange. In addition, when he put his cup against the wall, he heard disturbing words such as "Keep it hidden..."

To successfully brew coffee, Maou is advised by Kisaki, her manager, to take MgRonald’s barista training course. Meanwhile, back at the Demon King castle, Suzuno is training Chiho in the next room until late at night. Maou can't help but worry about Chiho every day, but at the same time, he also realizes that life is everything but staying the same every day. It changes with ever-moving time. So does Emilia, who is about to change the way she…

Suddenly, Farfarello, a demon claiming to be from the new Demon King's Army, and a boy named Erone appeared before Maou and his friends. Farfarello is suspicious of Maou's intention as the Overlord. Meanwhile, Chiho, realizing that she's the most vulnerable among Maou and his friends, she requested Sariel's help in rapidly mastering the holy spirit power to protect herself. However, before Chiho get to master that power, Erone appeared again…

Maou proposed to Emi to let Alas Ramus stay at the Demon King's Castle, but she immediately rejected his proposal, fearing that he was going to make her sleep on the hard tatami mats. But as she understands that he wants to sleep together with Alas Ramus, Emi pays half the cost and buys a futon for him. On the day when their shifts meet, Maou and Emi decide to go together to a shopping center in Seiseki Sakuragaoka. They have various…

Maou and his friends gather around the dining table at the Demon King's castle. It was a tranquil gathering until it got interrupted by Emi's words, saying that she's going back to her parents house for a while in Ente Isla. She's going back for a week to find clues about the holy sword, the fragment of Yesod, as well as the connection between the heavens and the demons. Emi left, saying that she would return on 12th at the latest, the day of…

A demon suddenly appeared at Chiho' school, Sasazuka High School, few days after losing contact with Emi. Chiho with her newly-learnt holy spirit power attracts the demon's chi as she tries to establish mutual understanding through dialogue like before. Maou, on the other hand, is at the driver's license center meeting Acieth Alla, a girl who claims to be Alas Ramus' younger sister, as well as Emi's father, Nord Justina. In the middle of their…

Suzuno and Urushihara rush to Chiho's plight, but in their absence, Gabriel's evil hand pushes its way to Ashiya in the Overlord's castle. Rika, who had visited Emi in her flat out of concern for her safety, and Nord, entrusted by Maou. Despite their desperate resistance, Ashiya and Nord are captured by Gabriel, and Rika's life is in danger. But then Amane intervenes and ....... Meanwhile, Maou is left in the lurch by the storm wall surrounding…

Emi returns to Ente Isla and heads for her home village of Sloan. When she arrives in Sloan village, she finds that the wheat field where her father grew up has survived. Empowered by this sight, Emi enters her birthplace, has dinner with Alas Ramus and searches for clues, where she sees a document. The next day, Alas Ramus ran out of the house and was sucked into the ward that lay ahead, including Emi, who was chasing after him. There, the moon…

Maou and Suzuno went through the Gates of Hell to Ente Isla to save Emi, who's trapped there, along with Acieth as the Sacred Sword. Maou and his friends ride their scooters through Efsahan forests towards Emilia, with numerous encampments in between. On their way, Suzuno asked Maou, the Overlord, as to why he led his people and attacked Ente Isla. In the meantime, Olba decides to bring Emi on his back and hunts the demons that devoured…

Before Amane questions the truth of Sephira, Shiba Miki, the owner of the Overlord's flat, appears before Chiho. She asks Chiho if she is prepared, and Chiho responds with determination, saying she doesn't want to run away. Meanwhile, Emi is raised as the Volunteer Army's flag bearer and engaged in a battle against the Malebranche Army led by Ashiya. Maou sets off for Ente Isla to end this situation, but Acieth's Scared Sword is not working. Can…

To protect humans and demons, the Overlord and the Hero have gathered in the Imperial Capital of Efsahan. Suzuno and Albert attempt to make contact with the Celestial Emperor, but they face Gabriel, who was waiting for them. Ashiya controls the Malebranche and Allied Knights Order to confront Emi and the Volunteer Army led by Olba. They decide to hold each other off until Maou arrives. Meanwhile, Maou and Ashia race to intervene in the impending…

Olba Mayer is already in a tight spot. Suzuno and Albert, who were thought to have fallen into Gabriel's trap, rescue Emerada, who is undergoing an inquisition in Saint Aile. Then, they open a gate and rush to the Heavensky. With the safety of Nord, the hostage, and the knowledge of the movements of the Emperor-Unifier and the angels secured, there are no more threats from behind. Now, all that's left is to defeat the true masterminds, the angel…