Firework was having an nise Hearth’s Warming; eating cookies, staying at his friends house, and going on quests with his fellow Destiny Knights. During one such quests, he stumbles upon a baby demon.

Now his entire Hearth’s Warming is turned upside down as he tries to help his new friend survive the coldest season, all while evading the eyre of his parents, Iron Hide, the local knight, and even Santa Claus.