The fourth season of Tensei Shitara Slime Datta Ken. Demon Lord Rimuru's dream of creating an alliance between humans and monsters takes a step closer to being realized. As Tempest continues to prosper, Granville Rozzo and his granddaughter, Maribel Rozzo, clash with Demon Lord Rimuru over their plan to protect mankind by ruling over them. Meanwhile, in El Dorado, Demon Lord Leon works toward goals of his own. The awakening of a new Hero draws near! (Source: Crunchyroll News)

The year is 2045, in a world where songs have been banned. Instead of humans playing instruments and creating music, a music app titled "MiucS" is in charge of these things. High school student Seria goes out with her friends one day, but she happens to hear someone singing, which is supposed to be prohibited. What she finds is a lone ghost, a "Great Ghost" who has appeared from outside this world. Now Seria must decide whether to stay silent or risk everything to bring music back to the world. (Source: Anime News Network, Crunchyroll, edited)

After the “Box of Malice” wiped out everyone he loved, Riddle spent a thousand years wandering the world of nothing. He lived in despair, searching for a way to change fate. After many centuries, he finally found a way back to the past. Returning to his younger self, with thousands of years of knowledge, Riddle begins his journey back to rewrite history.

The fourth season of Tensei Shitara Slime Datta Ken. Demon Lord Rimuru's dream of creating an alliance between humans and monsters takes a step closer to being realized. As Tempest continues to prosper, Granville Rozzo and his granddaughter, Maribel Rozzo, clash with Demon Lord Rimuru over their plan to protect mankind by ruling over them. Meanwhile, in El Dorado, Demon Lord Leon works toward goals of his own. The awakening of a new Hero draws near! (Source: Crunchyroll News)