A variety of countries appear in That Time I Got Reincarnated as a Slime. Of course, there are friendly countries, and also hostile ones. There are religious nations, and even unions within countries. We will introduce a list of these countries along with the main characters.
[That Time I Got Reincarnated as a Slime] National Situation: Rimuru's Nation, Tempest
Source: That Time I Got Reincarnated as a Slime © Taiki Kawakami, Fuse, Kodansha / TenSura Production Committee
Tempest originally began by subjugating goblins. They brought in dwarves to help with city development and protected monsters seeking refuge. The city continues to grow. Eventually, they turn a dungeon for adventurers into an attraction and begin crafting their own incredible weapons. Tempest becomes the center of the story.
Who is the Demon Lord living in Tempest?
Of course, Rimuru, the master of the nation, is there, but Ramiris is also employed in the dungeon. One of the oldest Demon Lords, she was originally a fairy queen who was able to bestow divine protection on heroes, but she succumbed to boredom and became a Demon Lord. Rimuru became a tutor to save five of Shizu's students who were summoned from another world. It was during this time that he helped save the five otherworlders from their downfall, which led to their connection. It seems that they are constantly hiring talented people. They also hire two members from the Moderate Clown Troupe.
【That Time I Got Reincarnated as a Slime】The First Friendly Nation: Dwargon, the Armed Nation
Source: That Time I Got Reincarnated as a Slime ©Taiki Kawakami, Fuse, Kodansha / TenSura Production Committee
Dwargon is an armed nation ruled by dwarves. Kaijin and Vector, who are employed by Tempest, are also from here. It is an industrialized nation, and in fact, they don't think very highly of the Farmas Kingdom.
Actually, Gazelle Dwargo is Rimuru's senior apprentice.
Source: That Time I Got Reincarnated as a Slime © Taiki Kawakami, Fuse, Kodansha / TenSura Production Committee
300 years ago, when the current dwarf king was still a child, he happened to meet Hakurou in the forest and received swordsmanship lessons from him. As a result, he calls himself Rimuru's senior apprentice and is a truly kind king, offering advice and assistance whenever the need arises. It was out of kindness that he sent Vector to Tempest.
[That Time I Got Reincarnated as a Slime] Situations in Each Country: The Farmus Kingdom Attacks Tempest
The Farmus Kingdom attacked Tempest while Rimuru was away. Their reason was a decline in their own income due to Tempest's prosperity. Killing Shion angered Rimuru, leading to the massacre of all 15,000 soldiers. This was also the trigger for Rimuru's ascension to the Demon Lord. The kingdom's king, Edomaris, was tortured.
Youmu Becomes King
Source: That Time I Got Reincarnated as a Slime ©Taiki Kawakami, Fuse, Kodansha / TenSura Production Committee
After that, the Farmas Kingdom began to fall apart, and young men began volunteering to protect the people's property and fight against the greedy nobles. Their leader was Youmu. With the support of his people, he pacified the entire territory of the former Farmas Kingdom after two years. And so, the Kingdom of Farmenas was founded. This was also the fulfillment of the promise Rimuru made to Youmu when he became the Demon Lord: that he would become king.
[That Time I Got Reincarnated as a Slime] Situation in Each Country: Mutual Passage and Mutual Support - Burmund
Source: That Time I Got Reincarnated as a Slime © Taiki Kawakami, Fuse, Kodansha / TenSura Production Committee
Brummund, a country that signed a treaty with Tempest for mutual passage and mutual support against danger, actually posed the greatest threat to them all: the Eastern Empire. Rimuru was unaware of this and fell right into the trap, but they had a good relationship. He registered as an adventurer in this city and learned demon summoning in this country.
Guild Master Hughes
Source: That Time I Got Reincarnated as a Slime © Taiki Kawakami, Fuse, Kodansha / TenSura Production Committee
Hughes is the guild master of this country. Although he claims to be inspecting the Demon Kingdom, he is actually enjoying a vacation in Tempest, but he seems to be a fast worker. The adventurers accompanying Shizu also belong to this guild, and they exchange the materials they receive in Tempest for cash at the guild, so they seem to be highly regarded within the guild.
【That Time I Got Reincarnated as a Slime】National Situation: The Kingdom of Ingrassia, with its Free Association
Source: That Time I Got Reincarnated as a Slime ©Taiki Kawakami, Fuse, Kodansha / TenSura Production Committee
This is also the country where Shizu lived, and the city is home to glass display windows. Rimuru was so impressed by this cityscape that he built skyscrapers and installed similar glass display windows throughout the city.
Commander Yuuki Kagurazaka
Source: That Time I Got Reincarnated as a Slime © Taiki Kawakami, Fuse, Kodansha / TenSura Production Committee
Yuuki is the leader of the Freedom Association, a native of another world, and Shizu's student. While the manga makes it seem like he completely trusts Rimuru, in reality, he places restrictions on Hinata's thinking.
Vice Commander Kagari
Source: That Time I Got Reincarnated as a Slime ©Taiki Kawakami, Fuse, Kodansha / TenSura Production Committee
Kagari, the Vice Commander of the Free Association, is of elven descent. In fact, she is the spirit controlled by Kazalim, a former Demon Lord and member of the Moderate Clowns. In the final battle, she will join the Angel Army and fight against Rimuru and his allies.
[That Time I Got Reincarnated as a Slime] Situation in Each Country: Holy Empire of Ruberios
This religious and agricultural nation is under the control of the Western Saints' Church. Because they view monsters as evil, they attack Tempest. In fact, the god of this nation is the Demon Lord Luminous Valentine. After her country was destroyed by Veldora, Luminous considered raising humans as food. At the time, the situation was bad, and she generously sheltered the humans who came seeking refuge. This is what started it all.
Hinata Sakaguchi
After failing in her attack on Tempest (revealing that Yuuki had placed a thought restriction on her), Hinata came to the conclusion that Rimuru and the monsters in Tempest were not evil, but ultimately denied that the church had acted solely on Hinata's behalf. Ultimately, she became the chairman of the newly organized National Union Council, which also cooperated with the Free Association.
[That Time I Got Reincarnated as a Slime] Situations in Each Country: The Eastern Empire Ruled by the Reincarnation of the Hero Rudra
The Naska Nam Rimum Ulmeria Eastern Union United Kingdom is an empire ruled by Rudra Nam Ur Naska, the reincarnation of the Hero Rudra. They launched an attack on Tempest to carry out their Sage Training Plan, but failed. They then marched into Luminas' territory to seize the Soul Transmutation System. Velgrind, who was on Rudra's side, fought to recruit Veldora, but Rimuru joined the fight. Ultimately, they agreed to cooperate on the condition that they save the soul of the repeatedly reincarnated Hero Rudra.
Rudra Nam Ur Naska
The reincarnation of the Hero Rudra, he continues to make a bet with Guy. However, he appears to have lost much of his abilities due to repeated reincarnation. Rudra originally believed that humans were creatures capable of uniting in the end, and that there was no need for mediators like the Demon Lord.
【That Time I Got Reincarnated as a Slime】National Situation: Sorcerer Dynasty Sarion
Eren
[That Time I Got Reincarnated as a Slime] Situation in Each Country: Final Thoughts
Source: That Time I Got Reincarnated as a Slime © Taiki Kawakami, Fuse, Kodansha / TenSura Production Committee
This article summarizes the situation in each country, but there are also other countries ruled by Demon Kings, such as Eurasia and El Dorado. There's also Siltrozzo, which appears on the map but doesn't appear in the main story. I also hope to write about the Demon's Kingdom at some point.
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Original Novel

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