Mayu Nozomi plays Ran, a married woman living happily with her husband. While he is away on a business trip, she is suddenly attacked by a stranger—a delivery man—who locks a chastity belt onto her lower body. From that moment, she falls under his control and is subjected to brutal treatment of her most intimate areas. To remove the chastity belt, she is forced to summon the same violent man again and again, each time enduring intense sexual stimulation until her body begins to respond involuntarily. Under the complete domination of this unknown man, she loses her dignity as a wife, gradually consumed by forbidden pleasure. This tragic sexual drama slowly takes hold of her mind as well.