A couple, Dai-chan and Ama-chan, win a trip to a certain prefecture in the Tohoku region in a neighborhood lottery. The couple soaks up the romance and simple hospitality of a nostalgic, rustic guesthouse in Michinoku. However, the region is said to be the birthplace of an ancient custom: "night rape." A man sneaks up on a woman at night and forces her to have sex with him. Although it is a custom that is rarely seen these days, it was actually practiced in this region until relatively recently.