Yuichi Koga is an upper-class business executive, running his own adult video company, and living a successful life with his wife and daughter. Outwardly, his family seems really happy, but in reality Yuichi enjoys sex with everyone but his wife Chikako. One day, he gets a phone call from a woman named Sanae, an old elementary school classmate of his. Yuichi and Sanae immediately hit it off again and begin seeing each other, and Yuichi eventually discovers that they click in a sexual way. He has one of his usual one-night stands with her, without realizing that she had a very different impression than him. Soon, Sanae will stop at nothing to have Yuichi all to herself, including calling him at all hours, throwing stones at his house and vandalizing his car. But soon, Yuichi discovers that his old classmate Sanae actually died many years ago! If so, then who is the mystery woman? Amazingly, Yuichi later dies in a car accident, and the big secret is revealed: it was his wife Chikako who was controlling everything...
—Nikkatsu