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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 shōnen manga magazine Monthly Gangan Joker since August 2017, and its chapters have been collected into eight tankōbon volumes.
Jahy, the feared and respected number-two ruler of the Dark Realm, suddenly finds herself powerless and shrunken in the human world after a magical girl destroys a powerful mana crystal, which also destroys her home realm. The manga follows Jahy and her daily life as she learns to live in her new surroundings while she works to restore her original form, the mana crystal, and the Dark Realm.