The Great Jahy Will Not Be Defeated!
The Great Jahy Will Not Be Defeated! is a Japanese comedy manga series written and illustrated by Wakame Konbu. It has been serialized in Square Enix's manga magazine Monthly Gangan Joker since August 2017, and its chapters have been collected into twelve volumes as of November 2025. In North America, the manga is licensed by Square Enix.
An anime television series adaptation by Silver Link aired from August to December 2021 on ABC and TV Asahi's Animazing!!! programming block.
Plot
Jahy, the feared and respected second-in-command of the Dark Realm, suddenly finds herself powerless and shrunken in the human world after a magical girl destroys a powerful mana crystal. This action also destroys Jahy's home realm. The manga follows Jahy and her daily life as she learns to live in her new surroundings and to make friends. Meanwhile, she works to restore her original form, the mana crystal, and the Dark Realm.Characters
; Jahi; Nasu
; Boss Chisa
; Landlord Ryou
; Kokoro Sasaki
; Kyouko Jingu Magical Girl
; Sarva
; Demon Lord
; Su
Media
Manga
Originally starting as a one-shot in March 2017, Square Enix has serialized The Great Jahy Will Not Be Defeated! in its monthly manga magazine, Gangan Joker, since August 22 of the same year. As of November 20, 2025, twelve volumes have been published, starting with the first volume released on February 22, 2018. The series is set to end with the release of its thirteenth volume in Q4 2026.In North America, the manga is published by the Manga & Books division of Square Enix. The first volume was originally scheduled to release in September 2020, but had to be delayed due to the COVID-19 pandemic. The release date was changed to July 27, 2021.
Anime
An anime television series adaptation was announced on April 16, 2021. The two-cour series was animated by Silver Link and directed by Mirai Minato, with Michiko Yokote overseeing series scripts, Saori Nakashiki designing characters and serving as chief animation director, and Kōji Fujimoto and Osamu Sasaki composing the music. It aired from August 1 to December 19, 2021, on ABC and TV Asahi's Animazing!!! programming block.The first opening theme is "Fightin★Pose", performed by Yui Ogura, while the ending theme is "Tsumari wa Itsumo Kujikenai!", performed by NEGI☆U, a unit formed of Hololive Production-affiliated VTubers Minato Aqua, Oozora Subaru, and Momosuzu Nene. The second opening theme is "Seikatsu Konkyū Dame Dinero", performed by Sumire Uesaka, while the ending theme is "Petals", performed by Miho Okasaki.
Crunchyroll streamed the series outside of Asia. Plus Media Networks Asia licensed the series in Southeast Asia and released it on Aniplus Asia. On July 19, 2022, Crunchyroll announced that the series would receive an English dub, which premiered the following day.