This book follows the friendship and early life of Theor and his army friend Denji. We meet a few characters that appear in the prior books and we learn how they’d been involved in Theor’s life. Some of the events we’ve seen in the previous three books are explained in this prequel.
The book takes us through the war and Theor’s career as Annihilation Lieutenant. The action leads up to the point where Theor meets his wife, Allissah, foreshadowing in a way the events that occur in Pariah Sector.