Where to Read That Time I Got Reincarnated as a Slime After Season 3?

The Expansion of the Monster Kingdom

Season 3 of That Time I Got Reincarnated as a Slime focused heavily on the political tension between Rimuru’s nation and the Holy Empire of Lubelius. If you’ve finished the anime and want to see the "Labyrinth" and the "Founding Festival" arcs in full detail, you need to know where to jump in.

To continue the story via the Manga, you should start at Chapter 116. To continue via the Light Novel (the original source material), you should start at Volume 10.

The Definitive Version: Grab Tensura Light Novel Volume 10 on Amazon.

Why you should choose the Light Novel over the Manga: While the manga has beautiful art, Tensura is a story built on world-building, city-planning, and complex diplomatic negotiations. The anime often skips the "boring" logistics, but the Light Novel is where the genius of the series truly shines.

Starting from Volume 10, the focus shifts to the massive Founding Festival of Tempest. You get to see Rimuru acting as a true politician, organizing an international event that includes high-stakes dungeon exploration and massive trade deals. If you like the "Civilization-building" aspect of the series, the Light Novel delivers 10x more detail than any other medium.