Since the incident, Kiritsugu began living with Natalia who trained him to become a mercenary just like her and travel around the world in various conflicts. Due to his unique magic, Natalia creates special anti-magic bullets from Kiritsugu's ribs. During a mission, Natalia and Kiritsugu are assigned to kill a Dead Apostle mage who control bee familiars that turn their victims into ghouls. While Natalia boards the plane that he is in from Paris to New York, Kiritsugu heads to New York to kill the mage's associate. Both Natalia and Kiritsugu successfully eliminate their targets. However, the mage hid bees in his body which turns the passengers on board into ghouls. Natalia manages to get into the cockpit safely, but with the plane filled with ghouls, she requests Kiritsugu to do something for her. Kiritsugu then surprises Natalia saying he already has something planned. As her plane arrives in New York, Natalia and Kiritsugu have a talk reminiscing the time they spent together and the bond they shared. With her plane within his view, Kiritsugu does what he believes will save more people; destroy the plane to prevent a ghoul infestation with a Stinger along with Natalia. He pulls the trigger but not before he tells her he was glad to have her as his mother. The missile hits the plane on the side, and as the plane explodes the camera shifts to the cockpit and Natalia is seen smiling. As her plane crashes, Kiritsugu goes into grief of losing another loved one.