After being dismissed from his role as court magician for his perceived inadequacy, Alec Huguette is unexpectedly cast out by the Crown Prince. Amidst this rejection, the sole beacon of support comes from Yoruha, a former comrade from their Academy of Magic days. Reunited after a four-year parting, Yoruha extends an invitation to delve into dungeons together once more. Thus, the renowned adventuring party known as 'Lasting Period' is reborn, destined to reclaim its fame across the globe.