The Great Jahy Will Not Be Defeated! (ジャヒー様はくじけない！) 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.