Human Instinct(1978)

Tod is a war veteran who is always haunted by the images of the battle field. Tada brings him home after he has been treated in the hospital for a while. Tada’s boss takes her along on a business deal, and she sees her boss’s men being arrested for transporting heroin. Her boss and his men are coming to make her shut up, because she has seen and knows too much, but Tod sees the images of the enemy coming to attack him and Tada, so he kills them all.