Rimuru corners Clayman for a mastermind’s name and gets a sealed mouth, so he finishes the job. Carrion and Frey sit down from the Ten, Guy makes a slime name the new club, and Octagram is the word. A nation that started as a cave promise just became an eight-point star.
Previous: Season 2 Episode 23 — Returning from the Brink · Hub: That Time I Got Reincarnated as a Slime
Hook
Rimuru corners Clayman for a mastermind’s name and gets a sealed mouth, so he finishes the job. Carrion and Frey sit down from the Ten, Guy makes a slime name the new club, and Octagram is the word. A nation that started as a cave promise just became an eight-point star.
This page is the sequential stop after Episode 23 — 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 2, Episode 24 (overall #48)
- English title: Octagram
- Japanese episode title: 八星魔王（オクタグラム）
- Runtime: ~24 minutes
- Studio: 8bit
- Original air date: September 21, 2021
- Kagex score: 9.1 / 10
- Where to watch legally: Crunchyroll (region-dependent)
Should You Watch It?
Watch it. This is Season 2’s finale: the kill, the resignations, the naming of an age. Skip it and the demon-lord map of Season 3 has no legend. Ceremonial after the blood, still required. Sequential. If you have been here since Veldora in the cave, this is the other end of that handshake, with a worse seating chart.
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 “Octagram.” Fight-only watchers may feel the talkier stretches; nation-building fans will not.
Spoiler Warning
Spoilers for Season 2 Episode 24 (“Octagram”) follow. Stop above for a clean first watch. This page does not spoil later episodes.
Story Recap
A mouth that will not open
Rimuru has Clayman on the floor and wants the name above him — the mastermind Milim’s sting was hunting. Even dying, Clayman’s lips stay sealed. Fear, geas, loyalty, producer pride: pick one. The show does not give a clean confession. Raphael cannot loot a mouth that will not move. The investigation gets a corpse instead of a sentence.
That refusal is the sequel hook and the character: Clayman would rather die as a closed file than live as a snitch. Rimuru wanted a name to punch next. He gets a body and a mystery. Inherited will versus a sealed producer. The hall watches a slime fail an interrogation and succeed an execution.
Investigation gets a corpse instead of a sentence.
Finish it
Left with no other choice, Rimuru kills Clayman. Publicly. Walpurgis minutes: a newborn demon lord ended a Ten Great member who used a Church, a kingdom, a calamity, and a fake leash. Shion has already had her hits. The last one is policy. The producer exits. The workplace does not clap. It files.
Guy’s generation wanted to see if the slime could finish. He can. That is not the same as being liked. It is the entrance exam, graded in a corpse. Falmuth’s street, Shion’s grave, Megiddo’s light, this hall — one war, last door, closed.
Workplace does not clap. It files. Guy’s generation wanted to see if the slime could finish. He can. Not the same as being liked. Entrance exam, graded in a corpse.
Two chairs pushed back
Carrion and Frey announce they are stepping down as demon lords. The Ten become something that is not ten. Their reasons are their own — sting fallout, a desire to stop playing this workplace, a shift toward Rimuru’s orbit without the title. The math is the title card: eight. The old club cannot keep its letterhead.
Beastketeers hearing their king resign a calamity job is a different relief from hearing he is alive. Eurazania may get a quieter map. Tempest just absorbed the political blast radius of two retirements and one corpse. Rimuru did not ask for a staffing redesign of the world’s worst board. He gets one anyway.
Two chairs pushed back is how you get eight without a math lecture, plus one corpse.
Guy, naming as a chore
Guy coerces Rimuru into naming the new group. Eight lords, a rebrand, a slime who names goblins now naming an age. The joke is the job. The job is real. Rimuru’s whole career has been names as gifts. This name is a brand for people who can crack maps. He lands on Octagram: eight-pointed star, one point per lord, a symbol that is not “Ten Great” with two seats empty.
That is a founder’s move whether he wanted the founding or not. The cave slime who named himself with a dragon is now the man who named the demon-lord workplace. Sit with the rhyme. It is funny. It is also a target painted on Tempest in a prettier font.
A slime who names goblins now naming an age.
A slime in the star
Thus a slime became one of the eight, and a new age starts because Guy said the old letterhead was dead. Veldora is in the world. Diablo is on staff. Milim is a colleague who can act. Leon is still seated. The Church still exists. Youm still has a wrecked kingdom to king. Season 2 ends on a logo, not a rest.
Rimuru wanted a quiet life. He has a star. Kagex’s take: this is the correct finale because it is a rebrand, not a peace. The next seasons will spend that star. This hour just has to hang it. It hangs. Eight points. One of them is blue and tired and still, somehow, trying to be kind in a hall that smells like a producer’s last aura.
Story Analysis
Episode 48 is a finale of minutes: no confession, a kill, two retirements, a forced name. That is adult political anime inside a slime show, and it fits everything Rimuru has been. Naming Octagram is the same skill as naming Gobta, pointed at the sky. Clayman dying closed-mouth is the correct villain exit for a man who was always a middle manager for someone worse. Guy making the slime do the rebrand is seniority as comedy.
Pacing is execution then ceremony. Comedy is the naming chore. World-building: Ten Great dissolving into Octagram, resignations as a legal mechanic, a sealed mastermind as a sequel file. Emotional peak is quieter than Megiddo or Shion’s revival — it is a logo with blood under it. Required. A real ending. Not a rest. If you wanted Clayman to spill the true boss, the show said no, and I think that no is strong. Sealed mouths make sequels. They also make a slime look small in a hall of ancients, which is honest. He named the club. He did not get the combination to the safe.
Finale of minutes: no confession, a kill, two retirements, a forced name. Adult political anime inside a slime show, and it fits everything Rimuru has been. Naming Octagram is the same skill as naming Gobta, pointed at the sky. Closed-mouth death is the correct exit for a middle manager for someone worse. Guy making the slime do the rebrand is seniority as comedy. Quieter peak than Megiddo or Shion’s revival — a logo with blood under it.
Character Analysis
Rimuru as executioner and namer. Clayman as a closed file. Guy as the boss who assigns branding homework. Carrion and Frey as the retirees. Milim as a colleague, mask off. Shion as the surviving reason. Veldora as the family weapon in the seats.
Leon still not paying the Shizu bill. Diablo not even needing to be in the shot to feel like furniture of the new age. Beastketeers filing a quieter future. Youm offscreen with a palace. Raphael logging the minutes. Rimuru naming Octagram is the character rhyme of the series. Clayman not talking is the other. Guy smiling at a slime doing HR for calamities is the joke I will keep.
Rimuru is executioner and namer. Clayman is a closed file. Guy assigns branding homework. Carrion and Frey are the retirees. Milim is a colleague, mask off. Shion is the surviving reason. Veldora is family weapon in the seats. Leon still has not paid the Shizu bill. Diablo is furniture of the new age even off-shot. Beastketeers file a quieter future. Youm is offscreen with a palace. Raphael logs the minutes. Dual: namer, sealed mouth.
World Building
Octagram as the new demon-lord letterhead: eight points, eight lords. Resignation as a real off-ramp from the workplace. Execution at Walpurgis as a recognized transfer of a seat. A mastermind who can seal a dying servant’s mouth. True Dragons and primordials as the furniture of the new age, not the officers of it.
A slime on the star as a geopolitical fact human churches will have to reprint. Tempest as a demon-lord capital, not only a Jura federation. Names as the protagonist’s fundamental magic, now applied to an era. The map’s old “Ten Great” textbooks are wrong as of this hour. That is a finale’s job: make the encyclopedia reprint. It does.
Octagram as new demon-lord letterhead: eight points, eight lords. Resignation as a legal off-ramp. Execution at Walpurgis as recognized seat transfer. A mastermind who can seal a dying servant’s mouth. True Dragons and primordials as furniture of the age, not its officers.
Nothing here is later-arc homework. If a name or rule is only teased, it stays a tease.
Animation
Finale pageantry: Clayman’s end, resignations, the octagram sigil, group composition of eight. 8bit goes ceremonial after two hall-flexes. The kill is not Megiddo-scale; it is a period. The symbol is the poster. Lord designs in one shot. Fine, a little static in the naming talk, saved by the logo landing. Season-end credits energy. The star looks like a logo because it is one. Good.
Finale pageantry after two hall-flexes: Clayman’s end, resignations, octagram sigil, eight in one shot. The kill is a period, not Megiddo-scale.
Kagex animation score for this episode: 8.6 / 10 — peaks vs average cuts, not a sakuga clip ranking.
Music and Voice Acting
Score 8.8. 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
- Clayman’s sealed mouth is the sequel file; the sting found a producer, not the author.
- Rimuru naming Octagram is the same magic as naming goblins, pointed at an age.
- Two resignations plus one corpse is how you get eight without a math lecture.
Best Moments
- Clayman dying without giving Rimuru the next name to punch.
- Carrion and Frey pushing their chairs back.
- A slime naming the demon-lord workplace because Guy told him to do the homework.
Pros & Cons
Pros: Specific to “Octagram” — Season 2’s real ending: a closed mouth, two retirements, a star with a slime on it. Required. The cave promise is now a letterhead.
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: 9.1 / 10 — Season 2’s real ending: a closed mouth, two retirements, a star with a slime on it. Required. The cave promise is now a letterhead.
- Story: 9.2
- Characters: 9.2
- Animation: 8.6
- Music: 8.8
- Enjoyment: 9.1
Octagram is such a Rimuru finale — he did not want the club, he named it anyway. Clayman staying shut is frustrating in the correct way. See you when the star starts taking fire from the Church and the leftover author.
What to Expect Next
Season 3 opens on demons and strategies — a quieter board with sharper knives, and a star that other people will try to pry apart.
Next: Season 3 Episode 1 — Demons and Strategies. Watch legally on Crunchyroll.
FAQ
Do I need to watch Season 2 Episode 24?
Yes if you are watching the TV series in order. Skipping “Octagram” leaves a hole later episodes assume you have.
What is the Japanese title?
八星魔王（オクタグラム） — Crunchyroll English title is “Octagram.”
When did it air?
September 21, 2021 in Japan. ~24 minutes. Studio 8bit.
Is this Season 2 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 48 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 characters — Rimuru, 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 24.
Keep exploring
- Tensura anime hub
- Season 1 review
- Overall review
- Previous: Season 2 Episode 23 — Returning from the Brink
- Next: Season 3 Episode 1 — Demons and Strategies
- Characters
- Fact and Spoilers
Your turn
Was “Octagram” 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.
