Ten years before the events of the main series, the Demi-human War has ended in the kingdom of Lugunica, but there’s still one last twist in the story of the Sword Devil and the Sword Saint. Stride sets a foul plan in motion, seeking to destroy Lugunica itself. Wilhelm chases him across the kingdom’s war-ravaged lands, facing struggles at every turn―until he discovers that Theresia is pregnant! Now taking up his blade to protect not only his country but also his beloved wife and unborn child, Wilhelm prepares to defeat Stride once and for all in the greatest battle Lugunica has ever seen.