Maki and her husband were struggling in their marriage due to his impotence. One day, Maki saw a TV program featuring a man named Saeyama, who called himself an "anal expert," claiming that anal sex could revitalize a failing marriage. Deeply moved by his words, Maki decided to take her husband's cock into her ass. However, unlike Maki, who became obsessed with the intense new sensations, her husband began avoiding her. The reason? He was overwhelmed by a powerful desire to see his wife's ass violated by another man. As this craving grew stronger, Maki unexpectedly reunited with Saeyama. This encounter would soon change their marriage in ways they never imagined.