That Time I Got Reincarnated as a Slime (Simuldub)

Rimuru and his Goblin riders set out for the marshlands to finalize their alliance with the Lizardmen. On the way, they save a Lizardman who'd been attacked by the Orcs.

The majin Gelmud makes his appearance at last. His true goal was to evolve the Orc Lord into the Orc Disaster, a Demon Lord, and have him reign over the Forest of Jura.

Post-war arrangements following the battle with the Orcs have begun. At the meeting, Rimuru reveals that he made a promise with the Orc Disaster, Geld, to take all of the Orcs' sins upon himself.

The Jura Tempest Federation, with Rimuru as its leader, has formed an alliance with the Armed Nation of Dwargon. Just as Rimuru thinks there are only peaceful days ahead, he senses an enormous mass of magical power heading straight for his location.

The Demon Lord Carrion has sent one of his Three Beastketeers, Phobio, on a raid of Rimuru's city. However, Phobio is quickly defeated when Milim meets his attack with her own. Rimuru and his subordinates then ask Phobio why he has come to their town.

Phobio can't restrain his anger toward Milim. He finds himself faced with Footman and Tear, two masked members of the Moderate Harlequin Alliance, who suggest that he become a Demon Lord to take revenge on Milim.

Rimuru and his forces attempt to destroy Charybdis with a full on attack, but fail, so Rimuru decides to take on Charybdis alone and learns the shocking truth!

Rimuru has a dream in which he sees Shizu teaching children at her school in the Kingdom of Ingrassia, showing Shizu's lingering regret. To see her wishes through, Rimuru leaves the Jura Tempest Federation and heads for the capital of Ingrassia.

Rimuru becomes the new teacher for Shizu's students. However, having been summoned into this world against their will and facing shortened lifespans as a result, the children's feelings are complicated, and they're reluctant to accept Rimuru.

Rimuru, Ranga, and the students enter the Dwelling of Spirits and are immediately met by a giant metal golem. Rimuru easily defeats it and one of the ten Demon Lords introduces herself. Can this tiny spirit really be one of the ten Demon Lords?!

Rimuru is successful in his attempt to calm the dangerous spirits dwelling within the children, and is confident that all of their problems have been solved.

After a dying woman summons a demon to avenge her, chaos ensues.