Logan and an American Lieutenant escape from a Japanese P.O.W. camp during World War II but when Logan falls for a local girl, the U.S. soldier feels betrayed and begins to stalk them.
Lt. Warren kills Atsuko and when Logan tries to take him down, he learns that the American soldier also has a powerful healing factor. The two are still fighting when the city of Hiroshima is bombed by a nuke and the two are caught in the blast.