Incestuous relationship with a long-lost cousin: Tsubaki Sannomiya and her cousin haven't seen each other for a long time, and now they're both grown up and adults. But the two of them are so close that they want to have sex with each other. Tsubaki Sannomiya's attraction is irresistible, so the cousin is also very interested. They spend 3 days and 3 nights making love to each other, and they're really eager for anything new. Where will this incestuous relationship go?