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In the parallel world of the Holy Cross Continent, the demonicThe Devil Satan (voiced by Ryohta Okiayu) sends his army to invade the surrounding territories. Humanity, led by the warrior Amelia (voiced by Hikaru Midorikawa), rises up in resistance and eventually invades the demon palace, forcing Satan to flee. When theDemon Lord regains consciousness, he finds himself, along with his loyal servant Alsheiner (voiced by Tomoki Ogawa), in a completely unfamiliar place: Tokyo, Japan. With their magical powers gone, the two are forced to survive by obtaining essential items like social security cards and bank cards, and they must work daily to maintain their basic needs. TheDemon Lord, who is constantly yearning to return to his homeland, one day discovers that Amelia has also tracked him to Earth! Although daily life is full of challenges, these three young people, who seem to be suffering from extreme self-centeredness, gradually adapt to life on Earth. Meanwhile, it appears that another force is lurking near them, always ready to eliminate the existence of theDemon Lord and the warrior... This film is adapted from the light novel *The Demon Lord's Castle is Just 6 Tatami Mats!* by Kageharu Sōshi.