The Slime Diaries

転スラ日記転生したらスライムだった件 (Tensura Nikki: Tensei shitara Slime Datta Ken)

7.6(177,062)

MAL Score

Ranked #1877

Popularity #712

Comedy
Fantasy
Isekai
Reincarnation

Episodes: 12
Duration: 23 min per ep
Aired: Apr 6, 2021 to Jun 22, 2021
Status: Finished Airing

Synopsis

Between monster hunts and diplomatic talks with neighboring nations, Rimuru Tempest still has to keep everyday life in his growing kingdom running smoothly. From planning seasonal work to handling the small chores that come with building a community, his schedule stays full.

Whether it’s tending fields under the summer sun or clearing snow when winter arrives, Rimuru and his companions tackle each task together, turning even routine duties into lively moments around Tempest.

Otaku Consensus

The Slime Diaries earns its reputation as one of the better Tensura side projects because Yuuji Haibara’s gentle direction and Kotatsu Mikan’s episodic series composition understand that Tempest is most appealing when its cast is allowed to breathe between crises. Its strongest material comes from the seasonal, kingdom-management comedy: agriculture, festivals, chores, and domestic rituals become character sketches rather than filler. The common complaint is also consistent: viewers outside the core Tensura fandom often find it dispensable, with low dramatic stakes that can register as pleasant background noise.

Why You Should Watch

Watch The Slime Diaries if you want the Tensura cast without the conquest pacing, power-scaling, or diplomatic pressure of the main series. It scratches the same low-stress itch as Laid-Back Camp, but with goblins, dragons, monster-girl comedy, and isekai city-building instead of tents and campfires. The appeal is in the texture: agricultural work, seasonal routines, shapeshifting gags, and ensemble banter that make Tempest feel like a functioning community rather than a map objective. Viewers who already like Rimuru will get a warmer, more domestic read on his leadership, while fans of kingdom-management anime get rare attention to the small labor that keeps a fantasy nation alive. Skip it if you need plot escalation; choose it if you want character intimacy.

Key Characters

R
Rimuru Tempest(VA: Miho Okasaki)
Rimuru is treated less as an overpowered isekai problem-solver here and more as a communal organizer whose shapeshifting, agender-coded presentation, and casual leadership style drive the spin-off’s humor.

What Makes It Stand Out

1
The series is built as a 12-episode episodic spin-off rather than a compressed side arc, matching AniList’s high Episodic tag rating of 93%. That structure lets individual installments focus on routines, jokes, and ensemble reactions instead of advancement through a central conflict.
2
Studio 8bit, the same studio credited on this entry, keeps the visual identity close to the parent Tensura anime while shifting emphasis toward softer expressions and comedic timing. The result is a companion piece that feels visually native to the franchise rather than a detached parody.
3
The staff configuration is unusually character-focused: Atsushi Irie and Risa Takai handle character design based on Shiba’s original designs. That matters for a diary-style comedy where readability of small reactions is more important than battle choreography.
4
Its tag profile is unusually specific for an isekai comedy, with Kingdom Management at 86% and Agriculture at 83% on AniList. Those tags explain why the show appeals to viewers interested in Tempest as a civic project, not just Rimuru as a protagonist.
5
The anime aired from April 6 to June 22, 2021, giving it a spring-season broadcast window that fits its calendar-like focus on seasonal life. The production’s rhythm makes the passage of time feel like the organizing principle rather than a side detail.

Fun Facts & Trivia

Fun fact 1: Fuse is credited for the original story, while Shiba is credited for the original character design, preserving the core creative lineage of That Time I Got Reincarnated as a Slime inside the spin-off.
Fun fact 2: The series composition is credited to Kotatsu Mikan, with Yuuji Haibara directing and Tsutomu Kasai serving as assistant director. That staff split supports the show’s sketchbook-like pacing, where tone control matters more than plot momentum.
Fun fact 3: On MyAnimeList, The Slime Diaries holds a 7.58 score from 176,832 votes, with a popularity rank of #712 and an overall rank of #1876. Those numbers place it in the unusual position of being widely watched for a spin-off while still trailing the mainline series in perceived importance.
Fun fact 4: AniList records a 74/100 score and 1,693 favourites, while its highest tags include Isekai at 94%, Episodic at 93%, Reincarnation at 91%, and Shapeshifting at 86%. The tag spread shows that viewers classify it as fully within Tensura’s genre identity despite its slice-of-life format.
Fun fact 5: Critical reception splits less over quality than purpose: positive coverage praises the humor and added affection for the cast, while negative reviews call it disposable or average. That divide makes it a litmus test for whether a viewer values franchise texture as much as forward plot movement.