Watch That Time I Got Reincarnated as a Slime Season 4 Episode 21 Online — Air Date & Full Guide

Name: That Time I Got Reincarnated as a Slime Season 4 Episode 21
Released: 2026-09-04

📅 2026-09-04 🎬 Episode 21 🏢 8-bit ⭐ 8.3/10

That Time I Got Reincarnated as a Slime Season 4 Episode 21 — Overview & Air Date

With 2026-09-04 approaching, attention turns to That Time I Got Reincarnated as a Slime Season 4 Episode 21 and what the latest installment has in store. The episode airs at Fridays at 23:00 (JST), with simulcast platforms typically releasing it within hours of the Japanese broadcast. Whether you are a longtime follower of the series or discovering That Time I Got Reincarnated as a Slime Season 4 for the first time, this guide covers everything you need — from the air date and streaming options to character spotlights and a full series overview.

The momentum leading into Episode 21 of That Time I Got Reincarnated as a Slime Season 4 is hard to ignore — social media chatter, fan theories, and community discussions all point to this being a standout installment.

About That Time I Got Reincarnated as a Slime Season 4

Demon Lord Rimuru's dream of creating an alliance between humans and monsters takes a step closer to being realized. As Tempest continues to prosper, Granville Rozzo and his granddaughter, Maribel Rozzo, clash with Demon Lord Rimuru over their plan to protect mankind by ruling over them. Meanwhile, in El Dorado, Demon Lord Leon works toward goals of his own. The awakening of a new Hero draws near! (Source: Crunchyroll News)

Few Action series command the dedicated fanbase that That Time I Got Reincarnated as a Slime Season 4 enjoys. With an AniList score of 8.3/10 and ranked #147 on AniList, placing it among the most-watched anime. The series spans 24 episodes, adapted from the original Light Novel, with each episode running approximately 24 min per ep.. It covers genres including Action, Adventure, Comedy, Kingdom Management, Isekai, Ensemble Cast, Magic, Demons, Time Loop, Dungeon, Politics, Spearplay, Agender, Medieval, Swordplay, Crossdressing, Henshin, Time Manipulation, Asexual, Male Protagonist, Skeleton, Femboy, Archery, Guns, Conspiracy, Gender Bending, making it a standout title in the current anime landscape.

Key Characters in That Time I Got Reincarnated as a Slime Season 4 Episode 21

Episode 21 features characters whose journeys have defined That Time I Got Reincarnated as a Slime Season 4 since its earliest episodes:

Rimuru Tempest (CV: Miho Okasaki) — A driving force behind the events of Episode 21, their choices ripple through every scene in That Time I Got Reincarnated as a Slime Season 4.
Diablo — A supporting presence in That Time I Got Reincarnated as a Slime Season 4 whose involvement in Episode 21 shapes the story in subtle but meaningful ways.
Kurobee — Though not always at the forefront, this character's perspective adds crucial layers to That Time I Got Reincarnated as a Slime Season 4's world-building.
Vesta — Their scenes in Episode 21 of That Time I Got Reincarnated as a Slime Season 4 provide both levity and deeper insight into the main cast.

Where to Watch That Time I Got Reincarnated as a Slime Season 4 Episode 21 Online

Streaming availability for That Time I Got Reincarnated as a Slime Season 4 Episode 21 varies by region. Simulcast rights are held by different platforms in different countries — check the official AniList page for That Time I Got Reincarnated as a Slime Season 4 for confirmed, up-to-date streaming links in your region.

Common services that carry current-season anime simulcasts include Crunchyroll, HIDIVE, and Netflix — but availability is title-specific and subject to change. Always verify on the platform before subscribing. You can also track the episode schedule for That Time I Got Reincarnated as a Slime Season 4 and every other airing series on AniVerse's Anime Release Calendar.

Broadcast Schedule for That Time I Got Reincarnated as a Slime Season 4 Episode 21

That Time I Got Reincarnated as a Slime Season 4 Episode 21 is scheduled to air on 2026-09-04. The regular broadcast window is Fridays at 23:00 (JST) — simulcast platforms typically follow within minutes to a few hours of the initial Japanese airing.

Staying current with That Time I Got Reincarnated as a Slime Season 4 is easy with AniVerse. Our Anime Release Calendar is updated every day with the latest air dates, platform availability, and broadcast schedules for all currently airing series. You can also explore our full That Time I Got Reincarnated as a Slime Season 4 series guide for character profiles, episode recaps, and community reactions.

Frequently Asked Questions — That Time I Got Reincarnated as a Slime Season 4 Episode 21

When does That Time I Got Reincarnated as a Slime Season 4 Episode 21 air?: That Time I Got Reincarnated as a Slime Season 4 Episode 21 airs on 2026-09-04. The scheduled broadcast time is Fridays at 23:00 (JST).
Where can I watch That Time I Got Reincarnated as a Slime Season 4 Episode 21 online?: Streaming availability varies by region. Check the AniList page for That Time I Got Reincarnated as a Slime Season 4 for confirmed streaming services in your area. AniVerse's Anime Calendar also lists air dates and platform links as they are confirmed.
What happens in That Time I Got Reincarnated as a Slime Season 4 Episode 21?: The episode continues the main story arc that has gripped viewers across That Time I Got Reincarnated as a Slime Season 4's run. Based on the series' trajectory, Episode 21 is expected to deliver pivotal story moments. Full details become available after the episode airs on 2026-09-04.
How many episodes does That Time I Got Reincarnated as a Slime Season 4 have?: That Time I Got Reincarnated as a Slime Season 4 has a total of 24 episodes, adapted from the original Light Novel. Each episode runs approximately 24 min per ep. and advances the overarching story.
Who produces That Time I Got Reincarnated as a Slime Season 4?: That Time I Got Reincarnated as a Slime Season 4 is produced by 8-bit, based on the original Light Novel. The series covers genres including Action, Adventure, Comedy, Kingdom Management, Isekai, Ensemble Cast, Magic, Demons, Time Loop, Dungeon, Politics, Spearplay, Agender, Medieval, Swordplay, Crossdressing, Henshin, Time Manipulation, Asexual, Male Protagonist, Skeleton, Femboy, Archery, Guns, Conspiracy, Gender Bending. With an AniList score of 8.3/10 and ranked #147 on AniList.

More That Time I Got Reincarnated as a Slime Season 4 on AniVerse

AniVerse is your complete destination for That Time I Got Reincarnated as a Slime Season 4 content. Explore the full series overview, browse our community discussions to share your episode reactions, and follow the AniVerse anime blog for news, reviews, and analysis covering That Time I Got Reincarnated as a Slime Season 4 and every other major title airing this season. You can also view the full entry on AniList for ratings, reviews, and streaming links.

That Time I Got Reincarnated as a Slime Season 4: Episode 21