Corporate worker Mikami Satoru is stabbed by a random killer, and is reborn to an alternate world. But he turns out to be reborn a slime!
Thrown into this new world with the name Rimuru, he begins his quest to create a world that’s welcoming to all races.

[Source: Crunchyroll]

Unaired episodes bundled with the 12th, 13th, 14th, 15th and 16th manga volumes of the manga adaptation of the novels.

The Jura Tempest Federation, the nation founded by protagonist Rimuru and all the monsters who decided to follow him, has entered into agreements and begun to trade with neighboring countries, making the ideal of a nation where humans and monsters walk side by side a reality. At Rimuru's core is a fondness for humans that comes from his history of being a human who reincarnated as a slime... but there is a definite hostility toward monsters in this world. When faced with this unfair reality, Rimuru makes a choice regarding what he doesn't want to lose. The reincarnation story that fans have long awaited plunges into a tempestuous new chapter!

[Source: Crunchyroll]

Between adventures, Rimuru settles into a quiet life in his beautiful kingdom, Tempest. But a town full of monsters comes with plenty of mischief. As the year passes, Rimuru unites his people the best way he knows how-with Japanese seasonal celebrations!

[Source: Crunchyroll]

The story is set in Raja, located to the west of Tempest. It used to be a flourishing nation thanks to its gold mines, but now there is no trace of the prosperity that once existed—the mines have poisoned the lake and the nation has fallen into dire states. Queen Towa used the magical power of her tiara, which has been passed down from generation to generation in the royal family, to remove the poison and protect her people. However, the magic comes at a cost. The curse that was cast upon the tiara has consumed her body and is eating away at her life. Amidst all of this, a survivor of the Ogres, Hiiro, suddenly appears in Tempest. He's supposedly Benimaru's older brother and tells them that his life was saved by Towa. Hiiro, who has come to Tempest to enlist the aid of Rimuru to help him save Raja and Towa, has a fateful reunion with Benimaru. Rimuru and friends make their way towards Raja to help the nation out from its crisis and unravel the mysteries surrounding Towa's curse, but they find themselves getting embroiled into an unbelievable conspiracy.

[Source: press release]

That Time I Got Reincarnated as a Slime × YOHANE THE PARHELION -SUNSHINE in the MIRROR- collaboration chibi short.

Rimuru has saved the children he was teaching in the Kingdom of Engrassia, and his time as a teacher is nearly over. Then Yuuki, Grandmaster of the Free Union, asks him to get to the bottom of the race for the throne in the Kingdom of Coleus, which is located between Engrassia and the Holy Empire of Lubelius. So Rimuru infiltrates Coleus under the name "Satoru," and he finds a nation at the mercy of not only a battle for succession, but a web of schemes woven by demons and vampires!

[Source: Crunchyroll]

Rimuru has officially become a Demon Lord after defeating Clayman. Following Walpurgis, the Demon Lords' banquet, Rimuru's domain is expanded to include the entire Great Forest of Jura.

Anticipating a flood of representatives from all races showing up to pay their respects, Rimuru decides to throw a festival to commemorate the opening of Tempest, using it as an opportunity to gain new citizens and present Demon Lord Rimuru to the world.

Meanwhile, in the Holy Empire of Lubelius, home base of the monster-hating cult of Luminism, Holy Knight Captain Hinata receives a message from Rimuru.

But the message is actually a fabricated declaration of war sent by some unknown party. Upon learning that Hinata is heading for Tempest, Rimuru makes a decision...

Thus begins a new challenge for Rimuru, striving to distinguish friend from foe in his pursuit of the ideal nation where humans and monsters can prosper together.

[Source: Crunchyroll]