It was recently announced on the official Twitter account and website of The Great Jahy Will Not Be Defeated! that the series will be receiving a televised anime series slated for this Summer. Along with the announcement, they released a visual teaser, and the author, Wakame Konbu, drew an illustration in celebration of the anime’s announcement. There is no additional information that has been revealed yet, but we will keep you posted!
Here’s the visual teaser for The Great Jahy Will Not Be Defeated!: 
And here’s Konbu’s celebration illustration:
Konbu’s comedy manga series, The Great Jahy Will Not Be Defeated! has been running in Square Enix’s Gangan Joker magazine and has compiled its sixth volume, as of April 2020. Square Enix was originally going to release the first English volume of the manga series on April 13th but the release was delayed until July 13th of this year.
The Great Jahy Will Not Be Defeated! has been acclaimed by many fans as one of their new favorite comedy manga series, with many having given their opinions on wishing the series would get enough attention to get an anime adaptation as well. Which of course came true! Square Enix Manga & Books describes the story:
The Great Jahy, the Dark Realm’s second-in-command, cuts a frightening figure, feared and revered by all. But when a run-in with a magical girl results in the destruction of the precious mana crystal, the Dark Realm falls, transporting the newly tiny and powerless Jahy to the human world! Unfortunately, plotting the revival of the Dark Realm from a cramped, crumbling one-room apartment is no easy feat when you have rent to pay and a job to keep!
Source: Twitter, jahysama-anime.com
