The ritual to kill Akari has begun, and everything is going smoothly. Menou believes this will finally be the end of the Otherworlder—until she receives word from Momo of Orwell's betrayal. The archbishop has woven an intricate plot and will use even taboo conjurings to achieve her goal. In the face of her staggering power, can Menou and the others hope to survive?

"Consider yourself lucky to die here." The fight between Menou and Master Flare in the land of salt begins to tip in the student's favor. Connecting to Akari's vast guiding force has enabled Menou to access the pseudo-concept of Time, a development that spells the conclusion to a battle that has ended in defeat countless times before. Yet during the fight, Ivory slips in and out of view. Elsewhere, Pandemonium enters the Star Memory. Something Manon left behind unknowingly has brought about a fatal change, and a catastrophe arrives at the furthest reaches of the world.

Menou sets out after Flare, determined to take back Akari. If Akari must die, Menou is determined to be the one that kills her, at the very least. To do so, Menou must seek the Sword of Salt-a difficult task even without a time limit. Still, the Executioner is determined to triumph and surpass her former teacher, no matter what taboos she must commit...

In order to kill Akari, Menou follows Orwell’s orders and boards a train to Garm. Unbeknownst to her, terrorists bent on capturing the princess Ashuna sneak onboard. Will Menou be able to deal with these unexpected foes on the runaway train, or has she met her match?

The Lost Ones are strangers from another world, hailing from a place no one has ever heard of called "Japan." These wanderers have been associated with catastrophes since many years ago and the solemn duty of exterminating them without remorse falls to Menou, a young Executioner. But when her mission is complicated by a Japanese girl named Akari who refuses to die, Menou embarks on a peculiar journey to find something that can slay even an immortal who insists on traveling with her wouldbe-killer!

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...

To kill Akari, Menou scours the outer reaches of the West in search of a legendary blade that turns all it touches into salt. There, she stumbles across Sahara, a monk, who has history with the young Executioner and begs her to take her life for reasons unknown. Meanwhile, the one of the Four Great Calamities begins to unfold in the undeveloped regions of the East and slowly inches toward them, leaving a trail of destruction in its wake...