Midori, a furniture designer, and Shigeru, a lawyer, are both divorced and have been maintaining an "adult relationship" for several years. However, Midori has begun to suspect that Shigeru—who claims to be busy with work—has found a younger woman. One day, while on a bus, Midori is groped by a mysterious, beautiful young man. This incident triggers a relentless stalking campaign by the youth against her...