Once, there was a large war. The war ended, and the world became peaceful. Now, anyone has a "Holy Grail" and summons a Servant bound to their fate. There is only one girl, Utsumi Erice who doesn't have one. This girl encounters the last Servant summoned into the world, a boy. But, she has no idea what her fate shall be.

When Lord El-Melloi II, the later Waver Velvet, gets asked to claim his inheritance over Adra Castle, he travels there with his apprentice Gray to do so. But they are not the only ones called that way. The will of the previous owner states that the assembled contestants—including Luviagelita Edelfelt—must compete in a game of wits to win the castle.

"I think you've lost if you fall in love—" —Hinooka Homura. Seiran High School 1st year. She likes to talk with friends. What she doesn't like are essays. By the way, she's the type that gets sleepy after thinking for ten seconds. Basically, she had the air of someone who had failed her high school debut. When Homura received the invitation "Why don't you try becoming a magician?," she joined the exploration club which had ties with the National Union. The club activities consisted of conducting research on an unknown planet. Along with the kendo boy Touya Takumi, Misasagi Mayo who was efficient both in her studies and in martial arts, as well as the golem Ameno, Homura parties with her friends and heads to the other world of Nutera, a huge scale planet that is several times the size of Jupiter. (Source: Official site)

The stage: the city of Snowfield in the western U.S., far from Fuyuki. There, a "false Holy Grail War", quite unlike the original Holy Grail War, unfolds. There were those who had been keeping an eye on the auguries of the Holy Grail in Snowfield. According to an investigation by the Mage's Association, the Holy Grail War system in Snowfield was an imitation of the one in Fuyuki. What's more, the system was incomplete, leading to the exclusion of one of the seven classes and the selection of beings as Servants who ordinarily could not be summoned. It was, verily, a strange fake. As an organ of the U.S. government executes its various plots, the Servants are summoned one after another...