Shinomiya Kyoya joins the mysterious GJ Club, comprised of the small but determined club president Mao, her opposite and younger sister Megumi, the universally recognized genius Shion, and the mysterious Kirara.

The club president says strange things in her sleep, Kyoya tries some suspicious coffee, and everyone starts to know each other a little better.

Kyoya is formally accepted as a member of the GJ Club, and receives a badge whose function is unknown even to the club president.

The GJ Club works to prepare something for the cultural festival and decide to provide wedding catering for their exhibit.

As an eventful winter unfolds for the club, Kyoya learns that Mao actually believes in Santa Claus and decides to take on the role himself.

Kyoya takes the day off to do something with his younger sister, and Mao suddenly invites Kyoya on an outing for which she's dressed pretty strangely.