Season 3

A martial arts tournament is being held. The winner will be given the right to challenge Rimuru. The hero, Masayuki, will be participating in the tournament. Rimuru wants to uncover the hero's true strength.

During the first day of the country opening festival, Rimuru goes around to the events that their friends have been looking forward to. Shion and Shuna's performance along with Vesta and Gabiru's research presentation were both a success.

The night before the country's opening ceremony, Rimuru and the Tempestians are entertaining their guests with a lavish meal. Then, Celestial Empress Elmesia of the Sorcerous Dynasty of Sarion descends upon them, causing a commotion.

After meeting with the various rulers of each country, Rimuru heads to Englassia to invite their students to the opening ceremony. Chloe and friends are overjoyed to see Tempest. It is there they are met by Masayuki, a chosen hero.

When Rimuru learns about the elven slave trade he discovers that the organization in question was destroyed by the hero, Masayuki, and that the hero is heading to Tempest with the goal of defeating the Demon Lord.

On the final day of the audience ceremony, Rimuru welcomes Momiji, the representative of the Tengu Tribe. Rimuru wants to dig a tunnel into the Khusha Mountains where they live, and has sent Benimaru as an envoy to negotiate.

An audience is held for Rimuru before the opening festival. Representatives of tribes living in the Great Forest of Jura enter the country seeking the Demon Lord blessing but three great men appear revealing their hostility towards Rimuru.

Rimuru was building a dungeon in preparation for the opening ceremony. He put Kurobe's weapons in the treasure chests and made Veldora live in the deepest part as the final boss. Then Milim suddenly appeared.

Demon Lord Ramiris is trying to forcefully settle in Tempest, an ideal place with delicious food, hot springs, and entertainment. Witnessing this commotion, Rimuru comes up with the idea of using Ramiris's skills for something.

The residents of Tempest are busy preparing for the opening ceremony. Rimuru visits his old acquaintance, the merchant Gard Mjöllmile, to brainstorm ideas for creating "entertainment that people will want to come back to again and again."

The Clerics of the Seven Luminaries were defeated by Luminous, ending the battle. Rimuru and Hinata began negotiating diplomatic relations and discovered the existence of the "Eastern Merchant" who had commanded the battle.

Just as the battle between Hinata and Rimuru was coming to an end, Hinata's sword moved on its own and aimed at Rimuru. Hinata risked her life to protect him but was seriously injured. Then the the Clerics of the Seven Luminaries appeared.

Diablo descends upon his enemy, King Edward, where he finds two of the Three Battlesages from the Emperor's personal guard division Rook Geniuses, Saare and Glenda, waiting for him.

Finally, war breaks out between the Crusaders and Rimuru within Tempest territory. Rimuru faces off against Hinata, who has put everything she inherited from her mentor, Shizu, on the line. What awaits the two in their deadly battle?

On the way to Tempest, Hinata sees the ramen and roads that Rimuru has made, she realizes that Rimuru is serious about wanting humans and monsters to coexist. However, against her will, her subordinate Leonard invades Tempest.

The spread of false information causes the Temple Knights to assemble, endangering Diablo's plan to conquer Falmuth. Meanwhile, Rimuru learns that Hinata is on her way to Tempest.

In the Holy Empire Lubelius, a military council was being held with Hinata as its leader. Hinata announces that she will try to talk to Rimuru on her own. Meanwhile, a hostile message arrives from Rimuru.

There are fears of human casualties caused by monsters ahead of the "Founder's Festival." Meanwhile, thanks to Vesta and Kaijin's inventions, there is hope for ensuring the safety of the highways. On the other hand, Rimuru gives Geld a new mission.

As Rimuru territory expands to cover the entire Jura Forest, it was expected that Rimuru would receive greetings from various races. Rimuru comes up with the idea of holding a Founder Festival for diplomacy and acquiring new residents.

Devastated over Clayman and Roy's demise, Yuuki and Luminus grapple with sorrow. Now viewing Rimuru as a formidable Demon Lord, they contemplate their next steps against him.

Satoru, a corporate employee, finds himself reborn as Rimuru, a slime in a parallel universe, after a random killing. He strives to establish a welcoming world for every race.

Rimuru defeats Clayman at Walpurgis Banquet, becomes a Demon Lord joining Octagram. Diablo anxiously proposes a contract with Veldora to learn about Rimuru's adventures. They discuss the banquet.