Deku chan and the gun

After Bakugou tells Izuku to jump off a building, Deku finds herself walking through a subway station only to run into a guy who drops his suitcase that looks exactly like hers. With their bags mixed Izuku opens the bag only to find a gun, an ancient gun that drives the holder crazy into a bloody frenzy. Now she turns into a hunter, an assassin hired to kill. What will it take to bring her down?