Winter will soon descend upon the Black Forest, and Forge Eizo must prepare. Storing food and supplies, adding stoves to the cabin, sewing winter outerwear—their to-do list just keeps growing. Then, one day, a fire spirit appears at the cabin claiming to have been born from Eizo's magical energy work in the forge! The family is excited to have this warm new addition to their household, but how does Lluisa feel about spirits encroaching on her forest? Meanwhile, Eizo receives a mysterious knife in the mail. Though the quality is poor, the form looks eerily similar to a Forge Eizo blade—the fake even has the fat cat insignia engraved on the pommel! Who would do such a thing? Can Eizo's ironclad reputation withstand such slander, or will this riveting counterfeit ruin his business?