Who Is the Author of "That Time I Got Reincarnated as a Slime"? Is There an Official X (Twitter) Account? An Explanation of the Manga, Novel, and Spin-Offs

"That Time I Got Reincarnated as a Slime" is a fantasy series about a slime with the strongest skills who rises to power together with a colorful cast of companions. Based on a story published on the novel submission website "Shōsetsuka ni Narō," the work was then published in book form, and a manga adaptation is being serialized in "Monthly Shōnen Sirius" (Kodansha).

Including spin-off works, the total number of novels and comics in circulation worldwide has exceeded 45 million copies. A TV anime adaptation has also been produced, with cumulative views reaching 3 billion and a third season airing from April 2024.

This article highlights information about the author of "That Time I Got Reincarnated as a Slime" and explains the creators behind the original novels, TV anime's source manga, and spin-off works.

About "That Time I Got Reincarnated as a Slime"

The setting of "TenSura" is another world where various races and monsters exist. Some are able to use magic known as skills. The protagonist, Rimuru Tempest, is a slime who has reincarnated from the modern world into this otherworld. After being killed in a random attack and ending his life as a human, Rimuru is reborn as a slime, and with the ultimate skills he obtained, he helps others and works to build a nation where people of all races can live together comfortably and happily.

Who Is the Author of the Novel "That Time I Got Reincarnated as a Slime"?

The novel version of "That Time I Got Reincarnated as a Slime" has been published up to volume 22 by GC Novels (Micro Magazine). While the serialization on "Shōsetsuka ni Narō" has already concluded, the book version contains extensive revisions and additional content and is not yet finished. Here, we summarize the profiles of the novel's author and illustrator.

The Author Is Fuse

■Novel author: Fuse
■Gender: Male
■Place of birth: Osaka Prefecture
■X (Twitter) account/blog: None

Fuse began posting "That Time I Got Reincarnated as a Slime" on "Shōsetsuka ni Narō" in 2013 while working as a salaryman. He does not have public personal social media accounts or reveal his face. Information about the book series and TV anime is shared on the "Shōsetsuka ni Narō" website.

Fuse has stated in interviews that, although he wrote novels aiming for awards while he was a university student, he was unable to finish them for various reasons. However, after starting his career and getting settled at work, the desire to write resurfaced, prompting him to start creating "That Time I Got Reincarnated as a Slime."

The reason for making the protagonist a slime instead of a human stemmed from the idea, "What if, instead of experiencing an isekai in a normal human state, I was transported there as a monster?" Slimes were not decided from the outset, but as he considered what kind of monster would be best for the main character, he came up with a slime, which seemed "the most familiar being in a fantasy world."

Illustrations by Mitz Vah

■Novel illustrator: Mitz Vah
■Gender: Male
■Place of birth: Himeji City, Hyogo Prefecture
■X account:@mitz_vah

Mitz Vah, who is responsible for the novel illustrations, shares progress and original artwork on X. Other main works for which he contributed illustrations and character designs include "Goshoku no Majyo" (Shueisha), "Ping Pong Lover" (Shogakukan), and the transmedia work "GABULI" (manga, MV, novel).

Mitz Vah has cited Rimuru, the main character, as his favorite from "That Time I Got Reincarnated as a Slime," especially in slime form rather than human guise.

The reason is due to the difficulties encountered during character design. After trying many patterns, he arrived at the current fine-lined slime design, thinking, "A shape that anyone can draw a rough sketch of while sober might be best." As Rimuru was the character into whom the most time was invested among the "TenSura" cast, Mitz Vah feels a particular attachment to him.

Who Is the Author of the Manga "That Time I Got Reincarnated as a Slime"?

The manga "That Time I Got Reincarnated as a Slime" is serialized in "Shōnen Sirius" (Kodansha). It is a popular adaptation of the book novel, with the latest volume 29 released from June 9, 2025. The anime "That Time I Got Reincarnated as a Slime" is based on this manga version.

Here's a summary of profiles for the manga's creator.

The Manga Is by Taiki Kawakami

■Manga author: Taiki Kawakami
■Gender: Male
■Place of birth: Tokyo
■X account:@Taiki_Kawakami

Manga artist Taiki Kawakami, who is in charge of the adaptation, publishes various illustrations related to "That Time I Got Reincarnated as a Slime" on X. Other notable works include "Maoyu: Maou Yūsha Gaiden Madoromi no Onna Mahōtsukai" (Kodansha) and "Alderamin on the Sky" (Kadokawa/ASCII Media Works).

Kawakami got involved with "That Time I Got Reincarnated as a Slime" by participating in a competition to adapt the series into a manga. Reading the novel for manuscript preparation, he became so absorbed in the world of "TenSura" that he found it hard to focus on his work. He recounted in interviews that he binge-read all the episodes on "Shōsetsuka ni Narō," resulting in nearly missing his manuscript deadline.

One difficulty in drawing the manga was Rimuru's eyes being invisible in the early chapters. He also worried, with a laugh, "Will it be okay if there are only dragons, slimes, old men, wolves, and goblins, but no girls at the start of the story?"

The Original Story Is by Fuse

The author of the novel, Fuse, also participates in adapting the story as the original creator, making adjustments to the plot and writing short stories. He also suggests ways to present the narrative, such as cutting explanations of skills, so that readers can quickly get into the story.

The character of Rimuru is slightly different between the novel and manga versions. In the early days, Fuse wrote "with the mindset that even a bad end would be acceptable," so Rimuru's mischievous side appeared until about volume 6. After changing his perspective, the manga starts out with Rimuru as a good person from volume 1.

There are also changes to Shizu, Rimuru’s fateful companion. The manga adds memories of her homeland and conversations not present in the novel, deepening the episodes of their meeting and parting. In interviews, Fuse expressed his happiness that "while the novel was sometimes accused of ‘not having a heroine,’ the comic version was praised for giving her ‘the most heroine-like qualities of any character.’"

Introducing the Authors of Nine "That Time I Got Reincarnated as a Slime" Spin-Off Comics

In addition to the main story, "That Time I Got Reincarnated as a Slime" includes official side stories that have been adapted into TV anime, such as "The Slime Diaries," as well as "That Time I Got Reincarnated as a Slime: Trinity in Tempest" and "That Time I Got Reincarnated as a Slime: Clayman's Revenge." Here is a summary of the authors and synopses of these nine spin-offs.

The Manga for "The Slime Diaries: That Time I Got Reincarnated as a Slime" Is by Shiba

■Spin-off manga author: Shiba
■Gender: Not disclosed
■Place of birth: Not disclosed
■X account:@sivvatwit

"The Slime Diaries: That Time I Got Reincarnated as a Slime" is serialized in "Monthly Shōnen Sirius" (Kodansha). This four-panel comic depicts the everyday lives of Rimuru, Shion, Shuna, and their friends living in the Jura Tempest Federation (also known as the Monster Federation or Tempest). It shows the humorous side of the characters not depicted in the serious main story, with content sure to make readers chuckle. Seven volumes are currently available.

Shiba, the manga artist for the spin-off, has not disclosed details such as gender or birthplace. Other works include "Ooki na noppo no," (Kodansha) and "Hakui-san to Robo" (Takeshobo).

The Manga for "That Time I Got Reincarnated as a Slime: Trinity in Tempest" Is by Tae Tono

■Spin-off manga author: Tae Tono
■Gender: Not disclosed
■Place of birth: Not disclosed
■X account:@t0nofnh

"That Time I Got Reincarnated as a Slime: Trinity in Tempest" is serialized in "Monthly Shōnen Sirius" (Kodansha). The story follows young female warriors sent on secret missions from Demon Lord Karion’s Beast Kingdom Eurazania, Demon Lord Milim’s Dragon Capital, and Demon Lord Frey’s Winged Nation Fulbrosia, as they cause commotion in Tempest. The series is currently at nine volumes.

Tae Tono has not disclosed personal details like gender or birthplace. Other works include "Yoru no nai Kuni 2: Hibi Hanazakari" (Kodansha).

The Manga for "That Time I Got Reincarnated (Again!) as a Workaholic Slime" Is by Shizuku Akechi

■Spin-off manga author: Shizuku Akechi
■Gender: Not disclosed
■Place of birth: Not disclosed
■X account:@sizuku0701

"That Time I Got Reincarnated (Again!) as a Workaholic Slime" is a four-panel manga that was serialized in "Monthly Shōnen Sirius" (Kodansha). It’s a wild gag comic imagining what would happen if Rimuru became a salaryman again in his new life as a slime. Rimuru, now section chief at the super “black” company Tempest Trading, managed by President Veldora, and with subordinates such as Benimaru and Shuna, experiences a grueling middle management life. The complete two-volume series has been published.

Shizuku Akechi, the manga’s artist, has not disclosed gender or origin. Other notable works include "Peddler in Another World" (Hobby Japan) and "Sekai de Yuiitsu no [Shinken Tsukai] Nanoni Senryokugai to Yobareta Ore, Kakuseisita [Shinken] to Saikyo ni Naru" (Bunkasha).

The Manga for "Tenchura! That Time I Got Reincarnated as a Slime" Is by Chacha

■Spin-off manga author: Chacha
■Gender: Male
■Place of birth: Not disclosed
■X account:@tyatya1112

"Tenchura! That Time I Got Reincarnated as a Slime" is a four-panel manga that was serialized in "Monthly Shōnen Sirius" (Kodansha). The story follows Rimuru, who has learned to transform from a slime into a human, but for some reason becomes a three-year-old child. The story is a lighthearted comedy with the companions of the Jura Forest being tossed around by the tiny Rimuru. All seven volumes have been published.

Chacha is a male illustrator who has not disclosed his place of birth. He shares information about his work on his X account.

"That Time I Got Reincarnated as Kōsaku Shima" is a Collaboration by Kenshi Hirokane, Fuse, and Taiki Kawakami

■"Kōsaku Shima" series author: Kenshi Hirokane
■Gender: Male
■Place of birth: Yamaguchi Prefecture
■X account: None / Official "Shima Kōsaku" account: @40shimakosaku

"That Time I Got Reincarnated as Kōsaku Shima" (Kodansha) is a one-volume spin-off comic imagining what would happen if Satoru Mikami, after being killed in a random attack, reincarnated not in another world but in the modern world as Kōsaku Shima. It is a collaborative work among Fuse (author of the novel), Taiki Kawakami (illustrator of the manga), and Kenshi Hirokane (author of the "Kōsaku Shima" series).

Kenshi Hirokane is a manga artist from Yamaguchi Prefecture. His famous works include "Section Chief Kōsaku Shima" (Kodansha) and "Human Scramble" (Shogakukan), and he has made many TV appearances. While Hirokane himself does not run an X account, an official "Kōsaku Shima" account exists to share work information.

The Manga for "That Time I Got Reincarnated as a Slime: Mamono no Kuni no Arukikata" Is by Shō Okagiri

■Spin-off manga author: Shō Okagiri
■Gender: Male
■Place of birth: Not disclosed
■X account:@s_yogi

"That Time I Got Reincarnated as a Slime: Mamono no Kuni no Arukikata" was serialized in the webcomic magazine "Comic Ride" (Micro Magazine), with eight volumes published. The bunny-girl Flamea is commissioned by Rimuru to create a guidebook for Tempest. The manga sets off with the story of Flamea's heart-throbbing reporting life in the city where monsters and humans live together in harmony.

Shō Okagiri is a male illustrator who has not disclosed his place of birth. Other notable works include "Torikago no Freiheit" (Fujimi Shobo) and "So, I Can't Play H." (KADOKAWA).

The Manga for "That Time I Got Reincarnated as a Slime: Clayman's Revenge" Is by Wataru Kajika

■Spin-off manga author: Wataru Kajika
■Gender: Not disclosed
■Place of birth: Not disclosed
■X account:@newdoukajika

"That Time I Got Reincarnated as a Slime: Clayman's Revenge" is currently serialized in "Monthly Shōnen Sirius" (Kodansha). The story depicts the rebirth of Demon Lord Clayman, who was defeated at the Demon Lords’ Banquet (Walpurgis), as he gets a new lease on life due to a twist of fate. The story—personally devised by Fuse—follows Clayman’s quest for revenge as he relives his life in an unexpected loop. Six volumes are currently published.

Wataru Kajika’s profile details such as gender and origin remain undisclosed. He provides work updates on his X account.

The Manga for "That Time I Got Reincarnated as a Slime: Peco to Rimuru no Ryori Techo" Is by Chika Nakatani

■Spin-off manga author: Chika Nakatani
■Gender: Not disclosed
■Place of birth: Not disclosed
■X account:@nakatanichika

"That Time I Got Reincarnated as a Slime: Peco to Rimuru no Ryori Techo" is currently serialized in "Monthly Shōnen Sirius" (Kodansha). After Rimuru meets a wounded goblin warrior, he gives him the name Peco and tasks him with "making sure everyone is well-fed." Starring Peco, who just changed jobs to become a cook, this is a gourmet spin-off comic in the "TenSura" universe. Four volumes have been published.

Chika Nakatani has not disclosed gender or place of origin. Other works include "Gekidan 20 Menso vs. Nanairo Inko" (Akita Shoten).

The Manga for "That Time I Got Reincarnated as a Slime: Bangaihen Toaru Kyuka no Sugoshikata" Is by Yuuzou Takada

■Spin-off manga author: Yuuzou Takada
■Gender: Male
■Place of birth: Tokyo
■X account: None

"That Time I Got Reincarnated as a Slime: Bangaihen Toaru Kyuka no Sugoshikata" is currently serialized in "Monthly Shōnen Sirius" (Kodansha). After the founding festival ends, Rimuru finally returns to a peaceful life in Tempest. But, when Veldora announces his intention to develop beast magic, Rimuru, Veldora, and Western Holy Church Holy Knight Captain Hinata embark on a journey to the magical tower, the holy land of magic. Three volumes have been published.

Yuuzou Takada is a manga artist from Tokyo. Other well-known works include "3×3 EYES" (Kodansha) and "All Purpose Cultural Cat Girl Nuku Nuku" (Futabasha). Fuse, the author of "That Time I Got Reincarnated as a Slime," has cited "3×3 EYES" as an influential work in his life. In episode 47 of the TV anime, there’s a scene where Veldora crashes the Walpurgis carrying a copy of "3×3 EYES," eager to read its final volume.

Artwork for the Children’s Book Edition of "That Time I Got Reincarnated as a Slime" Is by Moryo

■Children’s book edition illustration: Moryo
■Gender: Not disclosed
■Place of birth: Kanagawa Prefecture
■X account:@orimo07

The children’s book version of "That Time I Got Reincarnated as a Slime" (Micro Magazine) is a novel that rewrites the main story in a format more accessible to children. Author is Fuse, with illustrations by Moryo. Thirty-seven volumes have been published.

Moryo is an illustrator from Kanagawa Prefecture, gender not disclosed. His works include "Isekai Fantasy Character Collection" (Nippō Publishing).

Summary

The author of "That Time I Got Reincarnated as a Slime" is Fuse, with Mitz Vah handling the main novel’s illustrations and Taiki Kawakami drawing the manga adaptation, which serves as the basis for the anime. There are nine spin-off comics, allowing fans to enjoy the world of "That Time I Got Reincarnated as a Slime" from many unique perspectives.

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