It begins with a woman's search to find her husband, who disappears after watching a TV show. She enlists the aid of her husband's best friend, and together they discover that the famous female personality of the TV show disappeared after the same evening's broadcast as well. The duo's search leads to a battle within a religious cult. Each answer brings only more questions, until the story's stunning final solution is revealed.

is a parallel piece to Koji Suzuki's successful Ring series and even contains some sl nods to his famous work. Its theme of planet-wide subjugation via technology echoes that in Ring, and like Ring, the way in which the pieces of the mystery in Promenade come together only materialize in the book's final moments, culminating in a most unsettling conclusion.