"May These Leaden Battlegrounds Leave No Trace" is a manga series set in a war-torn world where advanced technology and magic intertwine. The story centers on Rain Lantz, a young soldier who possesses a unique ability to manipulate a powerful weapon known as the "Void Artillery." This weapon, capable of annihilating entire battlefields, is both a tool of destruction and a curse, as its use erases the memories of those involved, leaving no trace of the battles fought. Rain's ability to wield the Void Artillery makes him a valuable asset to the military, but it also isolates him, as he struggles with the moral implications of his power and the loss of personal connections.

The narrative unfolds as Rain is assigned to a special unit tasked with turning the tide of war. Among his comrades is the enigmatic and skilled fighter, Air Reevra, who harbors her own secrets and motivations. Air's presence challenges Rain's perspective on the war and his role within it, as she questions the morality of their actions and the true cost of victory. Their dynamic evolves from one of mutual distrust to a complex partnership, as they navigate the harsh realities of their world.

The plot delves into themes of identity, memory, and the consequences of war. Rain's ability to erase memories becomes a central conflict, as he grapples with the ethical dilemma of using a power that not only destroys enemies but also erases the humanity of those involved. The story explores the psychological toll of war on soldiers, the manipulation of truth by those in power, and the search for meaning in a world defined by conflict.

As the war progresses, Rain and Air uncover deeper conspiracies within their own ranks, revealing that the conflict may be driven by forces beyond their understanding. The series balances intense action sequences with introspective moments, creating a narrative that is both thrilling and thought-provoking. The characters' development is intricately tied to the unfolding plot, as they confront their pasts, question their loyalties, and strive to find a path forward in a world where the lines between right and wrong are increasingly blurred.