Karin and Kiriya's relationship is in jeopardy after a heated argument during Club Day at Kiriya's school. The following morning, Karin gets wind that her rival Yuka went on a group date with members of Kiriya's class, but Kiriya isn't talking. Is Kiriya cheating on her? But despite Karin and Kiriya's romance blowing hot and cold, their desire to spend Christmas together is overwhelming. Too bad Karin's father has them swaying to a melancholy holiday tune instead...