10 Years after the 4th Holy Grail War, the Emiya children become a part of the Gold Faction of masters in the Ikebukuro Holy Grail War. They must fight against the White faction with their servants. However the White faction is facing enemies within, and the overseers of this Holy Grail War have wishes of their own.

Gilgamesh is summoned into the modern era by a member of the Awakusu Group from Durarara!, but his Master has no interest in the Grail.

Summary: Post UBW Good Ending. Masaomi Kida is contacted by a woman named Taiga Fujimura, asking him to make contact with his biological cousin. Kida goes to Fuyuki get away from Ikebukuro after he dropped out of school. Masaomi expects Fuyuki to be a boring place to spend the summer, but then again, his cousin Shirou Emiya is a Mage.