That Time I Got Reincarnated as a Slime

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That Time I Got Reincarnated as a Slime 

That Time I Got Reincarnated as a Slime (Tensei Shitara Slime Datta Ken) is a Japanese light novel, manga, and anime series written by Fuse and illustrated by Mitz Vah. It stands out in the isekai genre with its mix of world-building, diplomacy, and epic fantasy battles.



Anime Overview


Story Summary

Satoru Mikami, a 37-year-old salaryman in Tokyo, is killed in a random stabbing and reincarnates in a fantasy world—not as a hero, but as a slime, the weakest of monsters.

Reborn as Rimuru Tempest, he gains powerful abilities like "Predator" (absorbing abilities) and sets out to explore this new world. Rimuru soon befriends dragons, ogres, goblins, and demons, eventually founding the Jura Tempest Federation, a peaceful nation of monsters.

Over time, Rimuru battles human kingdoms, demon lords, and god-like entities—all while seeking peace, equality, and prosperity for all beings.


Main Characters

  • Rimuru Tempest – Formerly a human, now a slime and leader of Jura Tempest Federation. Calm, strategic, and immensely powerful.

  • Veldora Tempest – The Storm Dragon and Rimuru’s first friend in the new world.

  • Benimaru – A powerful ogre warrior who becomes Rimuru's right hand.

  • Shuna & Shion – Loyal ogresses and advisors to Rimuru.

  • Milim Nava – An ancient Demon Lord and unpredictable ally.

  • Diablo – A mysterious and immensely powerful demon who pledges loyalty to Rimuru.


Light Novel & Manga

  • Original Light Novel by Fuse began in 2013 (online), then published by Micro Magazine in 2014.

  • Manga Adaptation began in 2015 by Kodansha, still ongoing.

  • Spin-offs: "The Slime Diaries", "That Time I Got Reincarnated Again as a Workaholic Slime", and others.


Season Breakdown

    Season 1 (2018–2019)

  • Introduction to Rimuru and world-building.

  • Nation-building arc begins.

  • Encounters with orcs, lizardmen, and Charybdis.

    Season 2 (2021)

  • Tempest is attacked.

  • Rimuru becomes a Demon Lord.

  • Tensions with humans and other demon lords rise.

    Season 3 (2024)

  • Based on "Holy Empire of Lubelius" conflict and Council of Demon Lords.

  • Diplomacy, politics, and larger-scale war themes. 

    The Slime Diaries (2021)

    Slice-of-life spin-off based on Tensura Nikki

  • Set between Season 1 and Season 2

  • Shows the peaceful daily lives in the Jura Tempest Federation

  • Focuses on character bonding, festivals, and everyday humor

  • Rimuru is more of a caring “manager” than a fighter here

  • Animated by 8bit, same studio as the main series

    That Time I Got Reincarnated Again as a Workaholic Slime

    4-koma parody manga / short-form web content

  • AU (Alternate Universe) comedy — Rimuru reincarnates into a modern office job

  • Full of gags about corporate life, overwork, and stress

  • Non-canon, made purely for fun

  • Office Rimuru still has slime form but now deals with paperwork instead of monsters

    Other Spin-offs & Adaptations

  • How Monsters Walk (Mamono no Arukikata)
    → RPG-style manga with humorous monster profiles and slice-of-life content

  • The Ways of the Monster Nation
    → Manga adaptation that retells the light novel’s plot with unique art and adjusted pacing


Movie Breakdown

That Time I Got Reincarnated as a Slime: The Movie – Scarlet Bond (2022): 

Set after the events of Season 2, this film features an original story by the author, Fuse. Rimuru helps resolve a conspiracy involving a mysterious power in Raja, a small country west of the Jura Tempest Federation. 


That Time I Got Reincarnated as a Slime: The Movie – Tears of the Azure Sea (2026): 

Announced to premiere in February 2026, this second film will take place after the events of Season 3 and follow Rimuru's group on a trip to a resort island


Popularity & Reception

  • Over 30 million light novels sold worldwide.

  • Well-loved for its balance of action, strategy, and humor.

  • "Slime Diaries" spin-off also adapted into anime for a comedic slice-of-life angle.


Themes

  • Rebirth & Growth – Reincarnation into a weaker being and rising to leadership.

  • Nation-Building – Unique among isekai for its political and structural focus.

  • Acceptance & Equality – Bringing together monsters, humans, and demons under one banner.


Where to Watch


Final Thought

That Time I Got Reincarnated as a Slime stands out as one of the most balanced isekai anime of its era — mixing world-building, politics, comedy, and explosive action with remarkable consistency. Rimuru’s journey from an ordinary salaryman to a nation-building Demon Lord feels both refreshing and emotionally rewarding, supported by a diverse cast and evolving alliances.

Its ability to shift from lighthearted slice-of-life to large-scale battles without losing charm is what continues to attract fans worldwide. With each season expanding Tempest’s future and the stakes surrounding Rimuru, the series shows no signs of slowing down. For anyone who loves isekai with strategy, heart, and power fantasy done right, Reincarnated as a Slime remains a must-watch.

Location: Japan

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