A man named Daishun discovers his beloved mother cheating on him. Instead of anger or sadness, he feels a possessive lust welling up inside him. Determined to make her his alone, he embarks on a series of depraved acts - strangulation, bondage, forced breeding. As she succumbs to the unstoppable pleasure, even her pain becomes part of the ecstasy... until eventually, he realizes that he has become nothing more than a loyal masturbation tool for this woman.