Christmas!.Yui's sister Ui Hirasawa remembers how Yui once attempted to give her a white Christmas when they were little, by putting pillow-stuffing on the tree outside. Ritsu decides to hold a Christmas party for the club, and while her initial plans of holding it at Tsumugi's house fail, they eventually decide to have it at Yui's house while Yui's parents are on vacation. Yui's friend Nodoka Manabe also gets an invitation. The girls decide to hold a gift exchange at the party, and go shopping for various gifts...