In a festive crossover, the characters from Fairy Tail and Nanatsu no Taizai come together for a Christmas tale. Meliodas, Elizabeth Liones, and Hawk find themselves in Magnolia for the holidays, but Meliodas' attempt to get a gift for Elizabeth takes an unexpected turn. Meanwhile, after a mission, Natsu Dragneel and Happy encounter a mysterious figure on their guild's rooftop, setting the stage for a peculiar showdown.