The Black Numbers is Diablo’s shopping trip: Jaune, Violet, Blanc, a greater demon who would not stay down, then Rimuru naming Carrera, Ultima, and Testarossa plus hundreds of peers. Tempest just acquired a primordial army. The title is a unit designation, not a metaphor.
Previous: Season 4 Episode 13 — New Companions · Hub: That Time I Got Reincarnated as a Slime
Hook
The Black Numbers is Diablo’s shopping trip: Jaune, Violet, Blanc, a greater demon who would not stay down, then Rimuru naming Carrera, Ultima, and Testarossa plus hundreds of peers. Tempest just acquired a primordial army. The title is a unit designation, not a metaphor.
This page is the sequential stop after Episode 13 — 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 4, Episode 14 (overall #86)
- English title: The Black Numbers
- Japanese episode title: 黒色軍団（ブラックナンバーズ）
- Runtime: ~24 minutes
- Studio: 8bit
- Original air date: July 10, 2026
- Kagex score: 8.8 / 10
- Where to watch legally: Crunchyroll (region-dependent)
Should You Watch It?
Watch it. This is the roster bomb of the cour. If you skip, Testarossa-in-the-Council later has no origin. Fight-heavy in the demon realm, talk-heavy at the naming. Spectacle episode. Exact duel choreography is less important than the political fact: Rimuru now has Black Numbers.
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 “The Black Numbers.” Fight-only watchers may feel the talkier stretches; nation-building fans will not.
Spoiler Warning
Spoilers for Season 4 Episode 14 (“The Black Numbers”) follow. Stop above for a clean first watch. This page does not spoil later episodes.
Story Recap
Diablo farms a yes
In the demon realm a Greater Demon fights Diablo, loses on loop, and swears over. Diablo then duels Primordial Jaune to recruit her for Rimuru. She wants to crush them instead, then reconsiders after he folds her. Violet is next, mid-punishment of lesser demons; skeptical, then in. Blanc is hardest. He cuts through her people to reach her. Three primordials walk to Tempest because one black primordial asked. That is Diablo’s love language: violence as a job interview.
Names that stick
They swear to Rimuru after he shows a power ceiling they cannot ignore. He gives bodies and names: Jaune → Carrera, Blanc → Testarossa, Violet → Ultima. He does the same to about seven hundred others, including Diablo’s looping victim. They evolve into Demon Peers. Black Numbers, Rimuru’s demon army. The headcount is the point. Do not invent extra title lore the episode does not spell. A named primordial is a walking foreign-policy incident. He just made three.
Why this is not a gag
Season 4’s West is playing committees and Greed. Rimuru answers with an army from hell on payroll. It is funny because Diablo is proud. It is terrifying because the Council asked for military contribution and he is about to over-deliver. Testarossa’s later Engrassia posting starts here, as a name on a slime’s tongue.
Color as a warning label
Jaune, Violet, Blanc — the show is introducing them as forces of nature who needed a reason to kneel. Rimuru’s reason is being stronger plus offering names. That is the same mechanic as Gobta. The scale is not. If the animation goes hard in the demon realm, this is a sakuga-bait week. If it does not, the naming still changes the map.
An army with a dress code
Black Numbers is a proper noun now. Tempest’s org chart just grew a wing the Western Nations cannot pretend is “some goblins with a slime.” The unsettling feeling next week is everyone else noticing.
Story Analysis
Recruitment as a raid. Comedy is Diablo’s HR methods. Awe is the naming. Unease is the headcount. Pacing is three duels then a ceremony. World-building is primordials as colored calamities who can still take a knee, Demon Peer as a mass evolution, and a slime’s name as the evolution key.
Keep claims to what aired: three primordials recruited by Diablo, named by Rimuru, plus hundreds of peers. No fake interviews, no extra original-demon trivia unless the episode spoke it. This is a power-structure hour more than a lore-textbook hour.
Character Analysis
Diablo is the recruiter in love with his boss. Jaune/Carrera, Blanc/Testarossa, Violet/Ultima are the new calamities on staff. The looping Greater Demon is the mascot of persistence. Rimuru is the namer who just became a primordial employer. Seven hundred peers are the army. Tempest’s older cabinet is mostly offscreen, which is the point: this wing reports through Diablo. The West does not have a character in the room, and that absence is a threat.
World Building
The demon realm is a hiring pool if you can beat the locals. Primordials have color identities and courts. Names from Rimuru trigger mass evolution to Demon Peer. A Demon Lord can field a numbered demon army as state military. That fact will sit on every Council agenda whether they like it or not. Bodies/vessels from last episode are the hardware this episode staffs.
Nothing here is later-arc homework. If a name or rule is only teased, it stays a tease.
Animation
Demon-realm duels are the spend. Naming ceremony is the second spend. 8bit should go as hard as a mid-cour budget allows on primordial presence. Three color palettes, one black army. If it looks cheap, the idea is still huge. Hopefully it does not look cheap.
Kagex animation score for this episode: 8.6 / 10 — peaks vs average cuts, not a sakuga clip ranking.
Music and Voice Acting
Score 8.5. 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
- Testarossa’s name here is why she can later stand in the Council as Rimuru’s monster diplomat.
- Mass-naming hundreds is Rimuru spending the same resource that knocked him down naming Kumara, at industrial scale.
- Diablo recruiting primordials is the Falmuth “let me handle it” instinct gone planetary.
Best Moments
- A primordial changing her mind after Diablo folds her.
- Three names landing like a sentencing.
- Hundreds of demons evolving at once.
Pros & Cons
Pros: Specific to “The Black Numbers” —
The army episode. Watch it. Cute Tempest just grew a primordial wing, and the West is not ready.
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: 8.8 / 10 —
The army episode. Watch it. Cute Tempest just grew a primordial wing, and the West is not ready.
- Story: 8.7
- Characters: 8.9
- Animation: 8.6
- Music: 8.5
- Enjoyment: 8.8
This is the “Tempest is not a town anymore” episode. Naming three primordials is insane and in-character. I am excited and slightly afraid for the Council.
What to Expect Next
Jobs for three demons, a school day, clowns at Leon’s door, and a concert invite to Lubelius.
Next: Season 4 Episode 15 — An Unsettling Feeling. Watch legally on Crunchyroll.
FAQ
Do I need to watch Season 4 Episode 14?
Yes if you are watching the TV series in order. Skipping “The Black Numbers” leaves a hole later episodes assume you have.
What is the Japanese title?
黒色軍団（ブラックナンバーズ） — Crunchyroll English title is “The Black Numbers.”
When did it air?
July 10, 2026 in Japan. ~24 minutes. Studio 8bit.
Is this Season 4 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 86 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 14.
Keep exploring
- Tensura anime hub
- Season 1 review
- Overall review
- Previous: Season 4 Episode 13 — New Companions
- Next: Season 4 Episode 15 — An Unsettling Feeling
- Characters
- Fact and Spoilers
Your turn
Was “The Black Numbers” 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.
