The Great Jahy Will Not Be Defeated!

Jahy-sama was once the second most powerful being in the Demon Realm, but when a magical girl suddenly invaded and destroyed the magical stone that was the core of the Demon Realm, it collapsed, and Jahy-sama fell into the human world. Afterwards, wandering around, she was rescued by a store manager and started working part-time at a pub, eventually living in a shabby 4.5-tatami apartment without a bath run by the manager's sister. Contrary to her once glamorous life, Jahy-sama now manages her meager magical powers to survive in the human world, leading a life of poverty. However, relying on the reaction of the magical stone, she gathers other magical stones in an attempt to restore the Demon Realm.