A forbidden incest story of a beautiful mother, Reiko, writhing in pleasure as she has sex with her son at a hot spring resort. The mother, who has always felt sexual desire in her son's eyes, tries to persuade him to come to his senses on this trip. However, Reiko also realizes that she secretly hopes that her son, who passionately desires her body not as a "mother" but as a "woman," will rape her forcefully.