This is a fantasy story about a sword and the magic of a girl warrior, Emiya, in a fictitious world. 
A strong country, Guroman, attacks and overtakes the country of Kukurit, though the particulars of when and where this happens are not given. As a means of keeping the peace, the two countries exchange their third prince and princess, respectively. 
Prime Rose, the third princess of Guroman, is placed in the custody of a noble family of Kukurit under the name of Emiya. She grows up into a self-centered high school student. 
Although Emiya is favored by Prince Pirar of Guroman, she becomes a girl wanted by the authorities for her aid to the people of Kukurit reacting against the oppressive government. She is saved by the sword master Jimba, and flees to the wilderness. 
In the meantime, mysterious Tanbara Gai musters the forces of the people of Kukurit in an attempt to overturn Guroman's control. Emiya also decides to cooperate on the scheme. 
(Source: tezukaosamu.net)

A devil sends two cities; Kujukuri City in Chiba Prefecture and Dallas in the U.S., to ten thousand years ahead in the future, makes them fight each other, and enjoys watching over the fight. The devil's name is Bazusu. So Tanbara Gai, a member of Time Patrol, fights this devil to stop the atrocity. 
(Source: AniDB)

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