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A terrorist attack on a train to Garm disrupts Akari's journey home, forcing her and Menou, an Executioner, to confront a foe summoned through forbidden magic. As the train spirals out of control towards a collision, they must unite to avert disaster. However, this harrowing event unveils a deeper, sinister conspiracy targeting both of them, setting the stage for a tumultuous adventure filled with danger and unexpected alliances.

The ongoing duel against Master Flare intensifies as Menou, now linked with Akari and her vast Guiding Force, faces unexpected challenges. Master Flare harbors secrets that could turn the tide in her favor. Amidst this conflict, a long-hidden entity from the Star Memory emerges, poised to execute a millennium-old plan. As Menou and Akari confront unprecedented threats, the stakes are higher than ever, and survival is uncertain. The narrative promises intense battles and unforeseen twists that will test their limits.

Determined to reclaim Akari, Menou embarks on a perilous quest for the Sword of Salt, facing daunting challenges and a tight deadline. Her mission takes a dark turn as she grapples with the moral complexities of her role as an Executioner, revealing her willingness to break taboos to achieve her goal. The narrative explores themes of loyalty, sacrifice, and the struggle for power, as Menou strives to surpass her former mentor while confronting the consequences of her choices.

Menou, a young Executioner, is tasked with eliminating the Lost Ones, mysterious beings from an unknown world called Japan, linked to disasters. Her mission takes a turn when she encounters Akari, a Japanese girl who defies death and insists on accompanying her. As Menou navigates this unexpected partnership, she embarks on a quest to discover a means to defeat an immortal, leading to a unique journey filled with challenges and revelations about life, death, and the bonds that form between enemies.

"The Lost Ones are wanderers who come here from a distant world known as Japan. No one knows how or why they leave their homes. The only thing that is certain is that they bring disaster and calamity. The duty of exterminating them without remorse falls to Menou, a young Executioner. When she meets Akari, it seems like just another job...until she discovers it's impossible to kill this girl! And when Menou begins to search for a way to defeat this immortality, Akari is more than happy to tag along! So begins a journey that will change Menou forever..."--Provided by publisher.