August 15, 2026 · 8 min read · Episode guide · Episode 13 · Kagex Blog

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That Time I Got Reincarnated as a Slime Episode 13 Review — Invitations for All Nations

Anime hub: That Time I Got Reincarnated as a Slime · Season 3

Contains spoilers for this episode.

That Time I Got Reincarnated as a Slime Season 3 Episode 13 Invitations for All Nations official promotional art
Official promotional art. © Fuse / Kodansha / Eight Bit / Tensura Production Committee

Kagex rating: 8.4 / 10

Episode: Season 3 · Episode 13 — “Invitations for All Nations”

Air date: June 28, 2024 · Runtime: ~24 minutes · Studio: 8bit

Invitations for All Nations is RSVP geopolitics. Gazel gets a letter. Ramiris wants a new house. Elmesia of Thalion clocks that Rimuru is an otherworlder without anyone telling her. The festival is now a regional summit with better snacks.

Previous: Season 3 Episode 12 — Festival Preparations · Hub: That Time I Got Reincarnated as a Slime

Hook

Invitations for All Nations is RSVP geopolitics. Gazel gets a letter. Ramiris wants a new house. Elmesia of Thalion clocks that Rimuru is an otherworlder without anyone telling her. The festival is now a regional summit with better snacks.

This page is the sequential stop after Episode 12 — not a random recap dump. Scores below are for this 24 minutes only.

Quick Information

  • Anime: That Time I Got Reincarnated as a Slime
  • Season / Episode: Season 3, Episode 13 (overall #61)
  • English title: Invitations for All Nations
  • Japanese episode title: 各国と招待状
  • Runtime: ~24 minutes
  • Studio: 8bit
  • Original air date: June 28, 2024
  • Kagex score: 8.4 / 10
  • Where to watch legally: Crunchyroll (region-dependent)
That Time I Got Reincarnated as a Slime official banner Season 3 Episode 13
Official banner art. © Fuse / Kodansha / Eight Bit / Tensura Production Committee

Should You Watch It?

Watch it for Dwargon, Ramiris’s labyrinth pitch, and Thalion entering the season. Low action, high map. If you skip, you will still see the dungeon next week, but Gazel and Elmesia’s reads on Rimuru are the adult supervision the festival needs. Fine for weekly viewers, not a hook episode.

Beginner-friendly? No as a start point. Watch from Season 1 Episode 1. This installment assumes you already know Tempest’s core cast — Rimuru at minimum.

Bottom line: sequential viewers should not skip “Invitations for All Nations.” Fight-only watchers may feel the talkier stretches; nation-building fans will not.

Spoiler Warning

Spoilers for Season 3 Episode 13 (“Invitations for All Nations”) follow. Stop above for a clean first watch. This page does not spoil later episodes.

Story Recap

Gazel reads the room

Gazel Dwargo and his people — Henrietta, Jane, Vaughn — hear about Rimuru’s Demon Lord evolution and get a festival invite. Gazel wonders what the slime actually wants. That skepticism is love and policy: Dwargon was Tempest’s first real state friend, and friends still have to ask whether a True Demon Lord throwing a fair is a flex. The episode treats the dwarf king as a peer, not a cameo, which is the right respect for a character who taught Rimuru how countries work.

Ramiris needs a hole

Back home, Rimuru bumps into Ramiris, Beretta, and Treyni, fresh out of the old labyrinth and hunting a new nest. He offers to build one under the unfinished arena and turn it into an adventurer dungeon. He hires her. She wants to hire the lycanthropes living on the build site and move their town inside. That is the labyrinth’s origin as a housing project plus a theme park. Tensura’s funniest infrastructure idea is still a Demon Lord’s answer to “where do I put my fairy.”

Elmesia does the math

In Thalion, Elmesia has an invite. Three months earlier she sent Erald to make peace with a monster nation, which already stressed him. Yoshida’s Rimuru link plus the festival plans overload Erald. Elmesia concludes Rimuru is an otherworlder who reincarnated — same Earth as Shizu, Hinata, Yuuki, different arrival method. She does this from reports. That is the scary thing about Thalion: their queen does not need a confession to see the isekai.

A dungeon under a stadium

Arena plus labyrinth is the double attraction. Rimuru is not hiding Veldora’s containment problem; he is productizing it. Ramiris as paid staff is the Octagram becoming Tempest HR. Lycanthrope relocation is the ethical version of “the dungeon needs NPCs.” If that sounds like a game, good. Rimuru has always been a gamer running a country.

The guest list gets heavy

Dwargon, Thalion, a fairy, a dryad, a doll demon — the festival is no longer Blumund-plus-friends. It is the West’s competent powers agreeing to be seen in a monster capital. That visibility is the point of invitations. It is also a target package. Kazak is still out there. Yuuki is invited. Maribel can buy a ticket. Episode 13 is the stamp on the envelope.

That Time I Got Reincarnated as a Slime key visual Season 3 Episode 13
Official key visual. © Fuse / Kodansha / Eight Bit / Tensura Production Committee

Story Analysis

Invitation episodes can be phone-tree padding. This one earns it with Elmesia’s deduction and Ramiris’s housing crisis. Comedy is Erald suffering. Emotion is light. Geopolitics is the texture. Gazel’s caution keeps Rimuru from looking unchallenged. Pacing is three locations, all talk, all useful.

World-building is Thalion as a long-lived elven superstate that can smell otherworlders, and labyrinths as portable Ramiris architecture. The lycanthrope town-inside-the-dungeon idea is the season’s best “Tempest solves problems by eating them into the floorplan.”

Character Analysis

Gazel Dwargo is the skeptical ally the festival needs. Rimuru is hiring a Demon Lord as a contractor. Ramiris is homeless and about to become the most important landlord in Jura. Beretta and Treyni are her cabinet. Elmesia is the queen who figures out the reincarnation without a monologue from Rimuru. Erald is the stressed diplomat. Yoshida is evidence in someone else’s file. Lycanthropes are about to become dungeon residents. The Dwargon staff cameos keep the dwarf court feeling like a country, not a Gazel solo act.

That Time I Got Reincarnated as a Slime promo art Season 3 Episode 13
Promo art. © Fuse / Kodansha / Eight Bit / Tensura Production Committee

World Building

Invitations are recognition. Dwargon treating a Demon Lord festival as a state visit is the old world’s stamp. Thalion’s intelligence culture can infer Earth origins from behavior and associates. Ramiris labyrinths can be rebuilt, moved, and staffed. Arena construction as a cover for a hundred-floor hole is Tempest zoning law. Otherworlders are a known class to people like Elmesia, not a unique Rimuru secret.

Nothing here is later-arc homework. If a name or rule is only teased, it stays a tease.

Animation

Dwargon stone, Thalion elegance, Tempest construction. Location-hopping TV. Ramiris energy is the motion in an otherwise still episode. Fine. Not a visual week.

Kagex animation score for this episode: 8.0 / 10 — peaks vs average cuts, not a sakuga clip ranking.

Music and Voice Acting

Score 8.2. 8bit’s TV mix leans on Elements Garden sting + silence. Japanese track is the reference for Rimuru’s dual register (cute slime vs office-brain). Dub timing varies by season; don’t wait on it to judge the episode.

Hidden Details

  • Elmesia clocking reincarnation is why she can later dump gold on Rimuru without buying the Church’s monster story.
  • Moving a lycanthrope town into the dungeon is the first “the labyrinth is a country” beat.
  • Gazel wondering about motives is the friend version of the Council’s later paranoia.

Best Moments

  • Rimuru offering a fairy a dungeon under a stadium like it is a studio apartment.
  • Erald short-circuiting on festival scope.
  • Elmesia quietly solving the isekai.

Pros & Cons

Pros: Specific to “Invitations for All Nations” —

A guest-list episode with a queen-level deduction and the labyrinth’s real pitch. Watch it for Elmesia and Ramiris; skip only if you truly only care about tournament punches.

Cons: Requires earlier episodes. Viewers who only want climax fights may call the political / logistics scenes slow even when they are load-bearing.

Final Verdict

Kagex overall: 8.4 / 10

A guest-list episode with a queen-level deduction and the labyrinth’s real pitch. Watch it for Elmesia and Ramiris; skip only if you truly only care about tournament punches.

  • Story: 8.4
  • Characters: 8.5
  • Animation: 8.0
  • Music: 8.2
  • Enjoyment: 8.3

Ramiris getting hired is my favorite HR decision in the series. Elmesia doing detective work from a letter is the “oh she is going to matter” chill.

What to Expect Next

Veldora gets a legal place to scream, and the hundred-floor death game starts looking like a product.

Next: Season 3 Episode 14 — Labyrinth and Storm Dragon. Watch legally on Crunchyroll.

FAQ

Do I need to watch Season 3 Episode 13?

Yes if you are watching the TV series in order. Skipping “Invitations for All Nations” leaves a hole later episodes assume you have.

What is the Japanese title?

各国と招待状 — Crunchyroll English title is “Invitations for All Nations.”

When did it air?

June 28, 2024 in Japan. ~24 minutes. Studio 8bit.

Is this Season 3 filler?

No. Tensura’s “quiet” hours are usually nation, diplomacy, or setup — not recap filler.

Where does this sit in the overall count?

Overall TV episode 61 of the main series (S1–S3 are 72; Season 4 continues from 73).

Should I watch Slime Diaries first?

No. Diaries is optional comedy. This review is the main TV track.

Where are character guides?

Tensura charactersRimuru, Veldora, Milim, and the Tempest officers.

Where are facts / spoilers for the franchise?

Fact and Spoilers on the hub. This episode page stays inside Episode 13.

Keep exploring

Your turn

Was “Invitations for All Nations” a continue episode or a skip-risk for you? Favorite beat? Who should get the next character page?

Sources: Crunchyroll episode titles; Wikipedia list of Tensura episodes; official Tensura anime site.

Our reaction

Spoiler-aware take after the recap — how the episode felt to watch.

8.4/10

Ramiris getting hired is my favorite HR decision in the series. Elmesia doing detective work from a letter is the “oh she is going to matter” chill.

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