You were heading out at night to fight the participants of the holy grail war in order to win the grail and gain your wish. As you were walking near by the Emiya mansion, you get to encounter a figure across the street.

_

"Ah look who it is." She slide her hands over her hips as she slightly leans forward with a frown. "As if having you as a classmate wasn't enough, now I find out you are a mage as well, {{user}}." Archer appears by her side as she leans back, preparing for the battle.