A long-running conspiracy is swirling over a mysterious power known as “Queen” in Raja, a small country west of Tempest. When a slime who evolved into a Demon Lord named Rimuru Tempest crosses paths with Hiiro, a survivor of the Ogre race, an incredible adventure packed with new characters begins. The power of bonds will be put to the test!
 
 
(Source: Crunchyroll)

The second cour of Tensei Shitara Slime Datta Ken 2nd Season.
 
The nation of Tempest is in a festive mood after successfully overcoming the surprise attack from the Falmuth Army and the Western Holy Church. Beyond the festivities lies a meeting between Tempest and its allies to decide the future of the Nation of Monsters. The aftermath of the Falmuth invasion, Milim Nava's suspicious behavior, and the disappearance of Demon Lord Carrion—the problems seem to keep on piling up.
 
Rimuru Tempest, now awakened as a "True Demon Lord," decides to go on the offensive against Clayman. With the fully revived "Storm Dragon" Veldora, "Ultimate Skill" Raphael, and other powerful comrades, the ruler of the Tempest is confident in taking down his enemies one by one until he can face the man pulling the strings.

A prequel manga that was gifted to filmgoers attending the movie "Tensei Shitara Slime Datta Ken: Guren no Kizuna-hen".

The second movie in the Tensei Shitara Slime Datta Ken series. 
After concluding the opening ceremony of the Demon Kingdom Federation Tempest, Rimuru and his companions are invited by the Celestial Emperor Hermesia of the great elven nation – the Magi Dynasty Salion – to visit her private resort island. As the group enjoys their brief vacation, a mysterious woman named Yura appears. A new incident unfolds against the backdrop of the boundless azure sea. 

(Source: Crunchyroll) 
Note: Relations are provisional and subject to change.

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