December 2096. Miyuki is ordered to return to Yotsuba’s house before the New Year under the pretext of celebrating it as a family. But Miyuki knows it’s just a cover for announcing an heir. And since she is the successor, one of her duties is to marry. During winter break, Tatsuya, Minami, and Miyuki return to the main house. Only there are people who disagree with this decision and are ready to stop them decisively…