Tensei shitara Slime Datta Ken: Mamono no Kuni no Arukikata
That Time I Got Reincarnated as a Slime: The Ways of the Monster Nation

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As a fan of the series, I considerably had fun reading it. It brought a lot of things I've enjoyed from a world building point of view. It mostly focused to certain points not introduced yet on the original manga. I wouldn't recommend this to someone who hasn't read ahead of the LN but as someone who is, it brought a lot of visuals to the things I could only read from the LN.

Although Mamono no kuni mostly focused it's theme on the exploration of the world but I doubt it will be enjoyable to everyone since it mostly focus on the mundane parts ... of the story. The character interactions mostly are predictable but still enjoyable, although the lead character seemed to need a bit of work, it's fun overall within the bias of the illustrations for the world.


I could whole heartedly say I enjoy it within the bias of being a fan of the series so take this review with a grain of salt.

WARNING! This spin-off follows the Light Novel and is much further ahead of the manga and anime. So if you don't want certain elements to be spoiled. Steer clear.

As of April 22, 2024, this spin-off has been officially discontinued due to the author's health.

This story follows a female rabbit-beastmen whose unique skill allows her to analyze things with much detail. This ability interests Rimuru who wants her to make a guidebook on the city/nation of Tempest.

So much like the Slime Diaries spin-off, this is a slice-of-life style story following the shenanigans of many known characters of the series. It is very entertaining if you wish ... for more shenanigans of the side characters. However, timeline-wise, this story jumps around a bit where it mentions plot points that already happened and shows characters that were introduced via Light Novel and will not cover it in the spin-off itself.

Again, if you don't mind spoilers or already know the gist of what's going to happen in the manga/anime, then it's worth a read.

As a fan of the original manga i was pretty enthusiastic when i first heard about this. Tensei Shitara was and still is able to shine with excellent world building, it´s characters and a story that may come of as generic at first, but is handled so well that you just can´t stop yourself from enjoying it.

Mamono no Kuni on the other hand doesn´t have any of these qualities. It is basicly a lifeless fanfiction with a mary sue author insert character as it´s lead. These words are sadly not an exaggeration. Every character knows her or want to know her, she has an unique ... skill and can do whatever the plot needs her to do. Characters of the original manga get thrown in your face on nearly every panel of every chapter so far and are mostly there to tell you how great this new character is. It´s rather frustrating to read.

Another quite irritating point is that this spin off is leaning on the light novel and not the manga and starts months or even years after the current arc of the manga. This means it shows characters that haven´t appeard in the manga adaptation and can even spoil some plotpoints for people who haven´t read the novel but do read the manga at the moment.


The artwork is the only thing that is at least tolerable, but nothing to write home about either.


All in all i can´t recommend this spin off to anyone. Just skip this one and save your time for something you can actually enjoy.