That Time I Got Reincarnated as a Slime: Clayman REVENGE Airs April 2027, Season 4 Cour 3 in July — Full Schedule

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2027 for That Time I Got Reincarnated as a Slime breaks down into a two-stage rollout: a spinoff in April, the main series in July. The TV anime of the official revenge spinoff That Time I Got Reincarnated as a Slime: Clayman REVENGE begins airing in April 2027, and Season 4’s third cour begins in July 2027. Which means next spring through summer, “Slime” runs continuously for a full six months.

The announcement dropped on September 25, 2026. It came via a special Season 4 x Clayman REVENGE collaboration video, released after the Season 4 second cour finale aired on July 25, 2026. According to the official word, this video is all-new footage from Eight Bit, the studio handling the animation.

Honestly, I read this news twice. A Demon Lord who got a clean exit in the main series is headlining his own TV series. And Takehito Koyasu is voicing him. Below I’ll lay out next year’s schedule using nothing but what’s officially out as of September 2026.

What’s the 2027 “Slime” schedule? Spinoff and main series run in parallel for six months

2027 gives you Clayman REVENGE starting in April and Season 4’s third cour starting in July. The spinoff leads, and the main series follows.

The table makes it plain: the only two things the official side has given us are “April 2027” and “July 2027.” Day of the week, time slot, network, and streaming platforms are all unannounced as of September 2026. Any roundup stating those definitively is guessing.

For reference, Season 4’s slot as of the April 2026 cour was Nippon TV’s “FRIDAY ANIME NIGHT” block, Fridays at 23:00 across a 30-station national network, plus BS11 on Saturdays at 22:00. Whether the third cour returns to the same slot is still pending announcement.

When does the Clayman REVENGE anime air, and who’s on staff and in the cast?

Clayman REVENGE begins airing in April 2027. Kentaro Sugimoto directs, Takehito Koyasu voices Clayman, and Eight Bit handles the animation.

The source manga runs in Kodansha’s Monthly Shonen Sirius, credited to three names: Kou Kajika, Fuse, and Mitz Vah. It’s the same setup as the main series with only the lead swapped out.

Comments from Fuse and Kou Kajika tell you the temperature of this project

Comments from the original creators came out alongside the announcement. They’re a good read, because the concept of the work is spelled out with zero pretense.

Clayman, wearing a completely serious expression, is chewing out a subordinate when the glass in his hand tips and spills wine. It leaves a small stain on his pure white suit, and the moment Clayman notices, he starts desperately trying to cover it up so nobody sees how uncool he looks. The concept of Clayman REVENGE was simply: isn’t that funny all by itself?

Source:That Time I Got Reincarnated as a Slime portal site

So this isn’t a serious revenge saga. It’s a story about laughing at a Demon Lord panicking over a wine stain on his white suit. Fuse reveals the project came out of “a passing idea,” and that the original scope was something like “two volumes.” Fan response kept the serialization going, and it made it all the way to an anime. A light starting point with a heavy landing — that’s a satisfying pattern, isn’t it?

…Comments like this get the blood going in a former manga cafe clerk. Back when I worked the floor, Sirius spinoffs were reliably shelved next to the main series with about a third of the turnover. Not many titles climb from there all the way to an anime adaptation.

Who is Clayman? Why a Demon Lord Rimuru killed gets to be the lead

Clayman is the Demon Lord who rules the puppet nation of Jistav, bearing the epithet “Marionette Master.” In the main series, he’s an enemy of Rimuru who ends up defeated.

According to the official site’s introduction, Clayman is “a man who wove schemes, manipulated others, and sought to rule the world,” and that ambition was shattered by a single slime: Rimuru Tempest.

In that long story, there was one Demon Lord who radiated a particularly fierce presence, and who became the catalyst that defined how Rimuru would live from then on. The master of the puppet nation of Jistav, the Marionette Master, Clayman.

Source:That Time I Got Reincarnated as a Slime portal site

That line, “the catalyst that defined how Rimuru would live from then on,” is doing real work. The official framing isn’t just “an enemy who was strong,” it’s “an enemy who changed the protagonist’s guiding principles.” Which is precisely why he can carry a lead role.

What kind of story is Clayman REVENGE?

This one spins out a history that “might have been” and never got shown in the main series, with the official side posing the question, “What if he had lived his life differently?” The teaser visual’s tagline reads “Redo everything, starting from that defeat!” and the official introduction closes with “This time, I’m the protagonist.” It’s an alternate-history tale that replays the same world from the losing side’s point of view.

Which means you can jump in without having read the main series. The only prerequisite is one line: “a Demon Lord named Clayman lost to Rimuru.” Conversely, anyone who followed the main story should find jokes planted specifically for people who already know how it ends.

Season 4’s third cour lands July 2027 — how far into the five cours are we?

Season 4’s third cour begins airing in July 2027. Season 4 is a split broadcast across five cours total, leaving cours 3, 4, and 5 to go.

Season 4 ran two consecutive cours starting April 2026, with the second cour finale airing July 25. The collaboration special released right after that is where the July 2027 date for the third cour was revealed. Which means exactly one year passes between the end of cour 2 and the start of cour 3.

What story is Season 4 telling?

Per Season 4’s introduction, the Jura Tempest Federation, having established diplomatic relations with various nations following the Founding Festival, moves toward realizing a “coexistence sphere for humans and monsters.” Behind the scenes, the ones who deem Rimuru’s rise dangerous are Granbell Rozzo, former “Hero” and head of the Five Elders of the Kingdom of Siltrozzo, and his granddaughter Mariabell Rozzo. The two of them, championing the protection of humanity through domination, collide with Rimuru.

On staff: Naokatsu Tsuda directs, Hitomi Ogawa handles series composition, Ryoma Ebata handles character design, and Eight Bit produces. Miho Okasaki voices Rimuru, and Daisuke Ono voices Granbell.

Let’s talk scale too. The first TV anime season aired from October 2018 to March 2019, and cumulative series circulation now exceeds 62 million copies worldwide, with cumulative anime views past 3 billion. One of my skateboarding buddies asked me, “Slime’s still going?” It isn’t just still going, the number of shows is increasing.

What’s great about Slime in 2027, and what’s worrying?

What’s great is six straight months of “Slime” across spring and summer. What’s worrying is the year-long wait for the third cour, and the fact that the spinoff’s network and streaming platforms are unannounced.

The good: April and July lock in “the year of Slime”

You chase Clayman REVENGE through the spring cour, and by the time you’re done, the third cour starts in July. No dead air. And both shows have Eight Bit on animation. Not having to worry about the art quality dropping just because it’s a spinoff is a big reassurance, isn’t it?

The concerns: a year-long gap, and still-thin information

There’s roughly a year between the cour 2 finale and cour 3. Knowing it’s a five-cour split structure doesn’t change how long the wait feels. Having a year open up right as the clash with Granbell and Mariabell is heating up is, honestly, rough.

One more thing. On the Clayman REVENGE side, we got the main staff and Clayman’s voice actor, but the network, streaming platforms, theme songs, episode count, and every cast member besides Clayman are all unannounced as of September 2026. Who plays the “Clayman Army” that Kou Kajika’s comment mentioned is unknown too. Cour 3’s episode count, theme songs, and time slot are also unannounced. The “unannounced” cells in that table aren’t laziness, the blanks are genuinely blank.

What should Slime fans do during the year-long wait?

The most reliable supply line for now is the original soundtrack “That Time I Got Reincarnated as Music 4 vol.1,” which started streaming on September 26, 2026. It collects 76 tracks total: the BGM from cours 1 and 2 plus TV-size versions of the theme songs, a number that amounts to stacking up nearly the entire score for two split cours.

There was on-the-ground activity too. On September 26, 2026, Animate Ikebukuro’s flagship store held a surprise giveaway of “special Clayman cosplay masks.” Handing out masks in stores the day after the announcement tells you exactly how game the project side is. I’m an Akihabara-once-a-week guy so Ikebukuro is outside my coverage area, but there’s surely another wave of stunts like this coming as April approaches.

Catching up is an option as well. According to the official broadcast information page, TV anime seasons 1 through 4 and both theatrical films are streaming on Amazon Prime Video, Netflix, U-NEXT, DMM TV, d Anime Store, and others (availability dates and windows vary by service). A year is plenty of time to rewatch everything straight through from season 1.

Summary: 2027’s “Slime” is a two-stage play — Clayman in April, Rimuru in July

The key dates one more time. Clayman REVENGE begins airing April 2027, and the third cour of the TV anime That Time I Got Reincarnated as a Slime Season 4 begins airing July 2027. Those two points are the core of the September 25, 2026, official announcement.

The spinoff’s staff: Kentaro Sugimoto directing, Yuji Ikuhara on series composition, Asumi Hashimoto and Hideki Sakai on character design, Eight Bit producing. Takehito Koyasu voices Clayman. Let me repeat the concerns too. There’s roughly a year until the third cour, and the spinoff’s network, streaming platforms, theme songs, episode count, and additional cast are all unannounced as of September 2026.

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