The War Begins

When (y/n) Emiya decides to join his older brother and sister in fighting in this years Holy Grail War, he learns that summoning a servant of his own is much harder than his siblings made it look. However at the very same time as (y/n) begins the ritual to summon his servant a strange phenomenon occurs causing (y/n)'s world and the world of Remnant to temporarily collide. Will (y/n) survive long enough to become a true mage, or will he die a horrible and painful death?