The Great Jahy was once respected as the Demon Realm's second greatest demon after the Demon King. Feared by the demon race, Jahy was at the summit of her life, demanding and doing whatever she wanted.

That was supposed to be the case, but--
In a battle against a magical girl, Jahy was banished to the human world.

Having lost her powers and attractive appearance due to the destruction of her mana crystal, Jahy's body is reduced to a small child-like stature.

Thus began the days of poverty in a four-and-a-half Tatami mat room and a part-time job at the bar.

Putting aside all sympathy and overdue house rentals, the Great Jahy's great ambition to restore the Demon Realm begins!

[Source: ANIPLUS Asia]