[Tensura] That Time I Got Reincarnated as a Slime Season 4 Episode 91 Story & Preview Cuts Released: Rimuru and Leon Clash Swords

The story and preview images for Episode 91 of the TV anime That Time I Got Reincarnated as a Slime (JP: 転生したらスライムだった件) Season 4 have been revealed. This episode will air on Friday, August 21 at 11:00 PM (JST), and will later be available on various international streaming platforms.

Episode 91 Story

Rimuru and Leon cross swords in order to discern Granbell's true intentions. Meanwhile, Luminous, who was battling Maria, notices that the item sealed within the Ark of the Night Sanctuary has vanished...

Introduction

After successfully holding the Founder's Festival and establishing diplomatic ties with various nations, the Jura Tempest Federation takes its first steps toward realizing the "Human-Monster Co-prosperity Sphere"—a world where humans and monsters can live together. Transcending the walls between races, the Federation continues to prosper hand-in-hand.

However, behind the scenes, there are those who view the rise of Demon Lord Rimuru as a threat. Chief among them are Granbell Rozzo, the former "Hero" and leader of the Five Elders of the Kingdom of Siltrozzo, and his granddaughter, Mariabell Rozzo. Championing the protection of humanity through absolute control, Granbell and Mariabell begin weaving a web of conspiracies to clash with Rimuru.

Meanwhile, in the El Dorado "Golden Garden," the Demon Lord Leon begins to move for a specific purpose. Between the Heroes who guard humanity and the Demon Lords who rule the world, various agendas intersect as a single "Hero" prepares to awaken.

With unyielding convictions in his heart, Rimuru's next battle begins!

Spring 2026 Anime List

Source : Tensura Official