"To the prime minister of Japan: Although you are more than 8,000 and 500 kilometers (5,280 miles) from the Islamic State, you willingly have volunteered to take part in this crusade," says the knife-brandishing militant in the video, who resembles and sounds like a British militant involved in other filmed beheadings by the Islamic State group. "You have proudly donated $100 million to kill our women and children, to destroy the homes of the Muslims."