>>535316895
Nobody, she just "popped out" because the Human Order is in disarray, destined to die of magical energy drain. Galahad saw this and, because the rules of chivalry dictate he must save her, he formed a contract with her. He's a "Gatekeeper of the world" (as in the Gatekeeper class), so he's capable of forming a Master/Servant contract despite being a Servant himself (and somehow has a ridiculously large mana supply).