Reborn as a blue slime into a world of goblins, dragons, and direwolves, little rimuru needs help. But after acquiring predator skill, he'll begin his quest to create a world that's welcoming to all races.

Taking a break from his time as a teacher, the powerful slime rimuru tempest returns to his kingdom. When trying to return, rimuru is stopped by a mysterious figure who is somehow able to constrain rimuru’s magical abilities.

To make his debut as a demon lord, rimuru hosts a festival featuring a banquet, a martial arts tournament, and a dungeon challenge with veldora as the final boss. But as guests arrive, will rimuru be able to distinguish between true allies and enemies?