Slime Watch Order: Complete Guide Including Season 4

So you just finished episode one of That Time I Got Reincarnated as a Slime and now you’re staring at a content list that includes four seasons, a movie, a spinoff series, and a handful of OAD episodes with no idea where to start. Welcome to the club. The franchise has grown into one of the most sprawling isekai properties out there, and if you jump in out of order you’ll hit spoilers, lose context, or just wonder why everyone keeps referencing events that apparently happened off-screen.

This guide lays out the complete slime watch order from first episode to latest season, explains what’s worth watching and what’s skippable, and tells you where to stream everything. No filler, no vague recommendations — just a clear roadmap.

The Complete Slime Watch Order at a Glance

Here’s the full recommended viewing order before we break each entry down:

1. Season 1 (Episodes 1–24) — 2018–2019
2. Season 1 OADs (Episodes 24.1 & 24.9) — Watch after S1
3. Slime Diaries (12 episodes) — After S1, before S2
4. Season 2 Part 1 (Episodes 25–36) — 2021
5. Season 2 Part 2 (Episodes 37–48 + OAD) — 2021
6. The Movie: Scarlet Bond — After S2, before S3
7. Season 3 (Episodes 49–72) — 2024
8. Season 4 (Ongoing) — 2025–2026

That’s the cleanest path. Now let’s go through each entry and what you actually need to know.

Season 1 — Where Everything Begins (Episodes 1–24)

Season 1 covers Satoru Mikami’s reincarnation as a slime in a fantasy world, his early friendships with the Great Sage and the Storm Dragon Veldora, and the founding of Tempest — the monster city he builds from scratch. This is where the tone of the series establishes itself: part political drama, part power fantasy, part found-family story.

The pacing is deliberately slow by isekai standards in the first arc. Stick with it. The Orc Disaster arc (roughly episodes 11 onward) is where the show finds its stride and most people get fully hooked.

Episode count: 24 episodes
Runtime: ~9.5 hours

Don’t skip the recap episodes (episodes 12.5 and 24.5 depending on the version you’re watching) — they’re bundled differently on some platforms. They’re optional padding, not story content.

The Season 1 OAD Episodes — Do They Matter?

The OAD (Original Animation Disc) episodes attached to the Season 1 manga and light novel volumes are a mild point of confusion for new viewers. Here’s the breakdown:

• Episode 24.1 — “Regarding Slime’s Daily Life” — A slice-of-life bonus episode that follows Rimuru through a typical day in Tempest. Completely canon in tone, nothing plot-critical. Fun watch if you like the characters.
• Episode 24.9 — “Ramiris’s Playroom” — Another bonus set around Ramiris and the labyrinth. Good comedic episode. Worth watching before you hit Season 2 since Ramiris becomes more prominent.

Verdict: Neither OAD is required viewing, but episode 24.9 earns a mild recommendation because Ramiris’s role expands in Season 2 and it’s nice to have that introduction feeling natural rather than abrupt. Watch them both if you’re enjoying the world — they’re about 45 minutes combined. Skip them if you just want story momentum.

Availability on these is spottier than the main series. Crunchyroll has them in some regions; otherwise check your usual alternative sources.

Slime Diaries — Skip or Watch?

This is the question everyone asks. Tensura Nikki: Tensei Shitara Slime Datta Ken — or The Slime Diaries — is a 12-episode spinoff that adapts the manga side story of the same name. It runs between Season 1 and Season 2 in the timeline, and it is emphatically not an action show.

Slime Diaries is a pure slice-of-life. Rimuru helps with a harvest festival. Characters go on a camping trip. There’s a hot spring episode. The tone is warm, comedic, and light — essentially a low-stakes vacation in the Tempest setting you’ve just grown attached to.

Should you watch it?

That depends on why you’re watching Tensura in the first place.

• Watch it if: You love the cast and want more time with them before the drama of Season 2 kicks in. It’s legitimately charming and does a good job fleshing out side characters like Shion, Shuna, and Gobta who don’t get much screen time in the main series.
• Skip it if: You’re here for the political intrigue and power scaling. Slime Diaries won’t hurt your comprehension of anything in Season 2, 3, or beyond. You can always loop back later.

One genuine reason to watch it in order: Slime Diaries ends on a tonal note that makes Season 2’s opening hit harder. Season 2 gets dark fast, and the contrast is intentional. If you go straight from S1 to S2 you’ll still feel the tonal shift, but Slime Diaries amplifies it.

Episode count: 12 episodes
Runtime: ~5 hours

Season 2 — The Story Gets Serious (Parts 1 & 2)

Season 2 is split into two cours (Part 1: January–March 2021, Part 2: July–September 2021), which is common for anime production schedules but can trip people up when searching for it on streaming platforms.

Season 2 Part 1 (Episodes 25–36) deals with Rimuru’s growing political obligations, the Jura Tempest Federation’s expansion, and tensions with the Western Holy Church. It’s slower-burn but essential groundwork. The finale of this cour is one of the most pivotal moments in the entire series.

Season 2 Part 2 (Episodes 37–48) is where the payoff lives. After what Part 1 sets up, Part 2 delivers the Demon Lord arc and fundamentally changes what kind of story Tensura is. Rimuru’s power ceiling shifts, the political stakes escalate, and several characters you’ve been following since Season 1 are tested hard.

There’s also an OAD attached to Season 2 — sometimes listed as episode 48.5 — which is another bonus side story. It’s a fun extra but skippable without consequence.

Episode count: 24 episodes (split into two 12-episode cours)
Runtime: ~9.5 hours

The Movie: Scarlet Bond — Where Does It Fit?

Tensei Shitara Slime Datta Ken: Guren no Kizuna-hen (released in Japan November 2022, international 2023) is the first theatrical film in the franchise. It’s an original story — not adapted from the light novel — set sometime after the events of Season 2.

The movie introduces Hiiro, a ninja from the same clan as Benimaru, and involves Rimuru getting drawn into a conflict in a neighboring kingdom called Raja. It’s self-contained enough that you won’t get lost, but several of the emotional beats depend on your familiarity with Benimaru’s backstory from the main series.

Watch it before Season 3. The film is confirmed to be referenced in Season 3 material, and one character introduced in Scarlet Bond has a role in the ongoing narrative. Going into Season 3 cold on the movie means a slightly jarring introduction.

The movie is genuinely good — better than most theatrical anime tie-ins that exist primarily as extended fanservice. The animation budget shows, the action sequences are a clear step up from the TV series, and it has an actual emotional arc rather than just a flashy boss fight.

Runtime: ~1 hour 50 minutes

Streaming availability for the movie is more limited than the main series. It’s been available on Crunchyroll in select windows and on physical media. Check current availability before you get to this point in the watch order so you’re not stuck waiting.

Season 3 and Season 4 — The Current Frontier

Season 3 (2024) adapts the The Octagram Soars Brightly arc and the early stages of what manga readers know as the increasingly complex geopolitical conflicts between demon lords, humans, and the various factions Rimuru has assembled. This is where the world-building the series spent two seasons setting up starts paying serious dividends.

If you’ve made it to Season 3, you know what you signed up for. The show deepens its ensemble cast rather than leaning entirely on Rimuru, which is a mature creative choice that some viewers appreciate more than others. For a full breakdown, check out our Season 4 War Arc Analysis for context on where the story is heading.

Season 4 is currently airing (2025–2026) and covers some of the most anticipated material in the light novel fanbase — the war arc that manga and LN readers have been waiting to see animated for years. For everything you need to know about what’s coming and what’s already aired, our Slime Season 4 Complete Guide has you covered.

New to the season or trying to catch up on what’s airing right now? We’re also tracking the broader Spring 2026 anime season if you want to see what else is worth adding to your queue.

Total Time Commitment — How Long Is This Watch?

Let’s do the math. Here’s the full slime watch order with approximate viewing times:

Minimum watch (skip OADs and Slime Diaries): ~30 hours through S3
Complete watch (everything): ~36 hours through S3

That’s a significant time investment, but it’s spread across a story that actually goes somewhere. Unlike some long-running isekai that spin their wheels indefinitely, Tensura has a clear arc and major status quo changes that keep the investment feeling worthwhile.

Where to Stream That Time I Got Reincarnated as a Slime

Streaming availability shifts, but here’s the current state of things:

Crunchyroll is your primary destination. Seasons 1 through 3 are available, including the OAD episodes in most regions. Season 4 is simulcasting on Crunchyroll as it airs. The Scarlet Bond movie has had availability windows on Crunchyroll — worth checking before you get there in your watch order.

Netflix has carried some Tensura content in certain regions, though availability varies significantly by country. If you’re outside the US, check your local Netflix library.

Slime Diaries is also on Crunchyroll and is typically easier to find than the OAD episodes since it aired as a full broadcast series rather than being disc-bundled.

For the most current streaming availability across all platforms, JustWatch is the most reliable aggregator to check in real time — their database updates as licensing deals change.

Frequently Asked Questions About the Slime Watch Order

Can I skip Season 1 and jump into Season 2?
No. Season 2 doesn’t recap the founding of Tempest or Rimuru’s early relationships in any meaningful way. You’d be watching power level escalations with no emotional context. Start from the beginning.

Does Slime Diaries need to be watched in the middle, or can I save it for later?
You can watch it later without breaking anything. The recommended mid-placement is purely about tone — watching it between S1 and S2 gives you a breather before things get heavy. But if you want to barrel through the main story first, Slime Diaries makes a perfectly good post-S3 comfort watch.

Is the Scarlet Bond movie required to understand Season 3?
Technically no, but recommended yes. The movie’s self-contained plot doesn’t gate-keep Season 3 comprehension, but a character from the film appears in Season 3 content and the emotional continuity is better with the context.

Are the recap episodes worth watching?
No. The recap episodes (like episode 24.5) are compilation clips with occasional new framing sequences. Skip them entirely unless you genuinely want a refresher before a new cour.

I’ve heard Season 3 is divisive — should I be worried?
Season 3 shifts the show further toward political maneuvering and ensemble storytelling. If you’ve enjoyed the worldbuilding and side characters, you’ll probably like it. If you’re primarily here for Rimuru smashing things, it’s a slower ride. Either way, go in with calibrated expectations. If you want a deeper breakdown of the arc and the character beats driving Season 4, check out our Rimuru Tempest character analysis.

Where does the anime leave off compared to the light novel?
As of Season 4 (currently airing), the anime is in the War Arc — a fan-favorite stretch of the light novel that covers major battles and political consequences for Tempest. The light novel is complete at 22 volumes, so if you want to race ahead, that option’s available. Just know the manga and LN are further along than what’s currently animated.

Final Thoughts on the Slime Watch Order

The slime watch order isn’t complicated once it’s laid out, but the franchise has enough supplementary content that it’s easy to get confused by what’s essential and what’s bonus material. The short version: watch everything in release order, treat the OADs as optional extras, give Slime Diaries a chance if you like the cast, and don’t skip Scarlet Bond before you hit Season 3.

The series is a slow build that rewards patience. The payoff between Season 1 Rimuru — confused, experimenting, figuring out what he wants to build — and Season 4 Rimuru, navigating the consequences of that construction, is genuinely satisfying in a way that not many isekai manage to deliver. Clear your schedule.