Chisa Kirishima's peaceful life with her husband takes a sudden turn when an unexpected phone call arrives. The caller is a man named Muraoka, who knows secrets from her husband's past. He drugs Shoji into unconsciousness and takes advantage of the situation to expose Chisa's hidden desires. Right in front of her beloved husband, he reveals just how depraved she truly is. In the end, the filthy fingers of this wicked man penetrate the beautiful, mature Chisa's anus. Her happy everyday life shatters in an instant, and she is fated to fall completely under his control.