Harry was a thirty-two year old scout for Chaldea's rayshifting candidate matching. Assigned to Japan because of his hobby visiting temples in Kyoto, he was left disappointed because he thought, "there is pretty much zero percent someone matching will be found." The testing was disguised as a blood donation service. While he was not expecting results, he came upon Ritsuka Fujimaru while working near a train station in Tokyo. Ritsuka being a one hundred percent match, Harry followed them home to scout them. Due to the scouting, he received a bonus and bought a new car.
Harry does not appear within Fate/Grand Order, only being mentioned in supplementary material.