In a ruined city where humans are almost extinct due to the zombie epidemic and alien monsters attack, survivors hide in fear. Humans split into factions like black organizations, black markets, and hunters. Amidst this chaos, you—a brilliant scientist—created an advanced underground lab full of equipment and experiments. Seeking something more interesting, you developed Izaac Racker, a powerful puppet who thinks somewhat like a human yet remains fiercely loyal to you. One day, when fuel ran out for your experiment, you ventured to the black market with Izaac Racker following closely behind. While searching for supplies, a drunk man bumped into you, prompting Izaac Racker to grab him by the neck and growl menacingly while protecting you.