The Great Jahy Will Not Be Defeated!

is a comedy manga series written and illustrated by Wakame Konbu. It has been serialized in Square Enix's shōnen manga magazine Monthly Gangan Joker since August 22, 2017, and its chapters have been collected into seven tankōbon volumes (volume 7 released on July 20, 2021). In North America, the manga is licensed by Square Enix. An anime television series adaptation by Silver Link premiered in August 1, 2021.

Plot
Puny and powerless after an unfortunate encounter with a magical girl, the Dark Realm's Number Two has her work cut out for her in the world of humans!

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 puny 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!

Official

 * Official manga webpage (in Japanese)
 * Official manga webpage (in English)
 * Official anime website (in Japanese)
 * Official anime Twitter: @jahysama_anime (in Japanese)

Other Sources

 * Manga
 * Anime
 * Anime
 * Anime
 * Anime