Half a year has passed since Menou’s battle with Master Flare. Still on the run from the Faust, she searches for a way to restore Akari, her dearest friend. Her hunt leads her to the Starhusk, one of the Four Major Human Errors. A once in a decade event called “the Hatching” seems to be the key. But to have any chance of reaching the Starhusk, Menou must contend with the Inquisitor Ivory dispatched to stop her-Michele.

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...

Journey to where the fog never lifts… Libelle, a city by the sea. Those who venture into its fog are said never to make it back alive—a murderous phenomenon that’s another of the Four Major Human Errors that has ravaged the world. But for Menou, it just may be the solution she’s looking for. To fulfill her role as Executioner, she needs to find a way to murder Akari, the girl who seems to spring back to life whenever she’s killed. Maybe this time, Menou will be successful in carrying out her duty... but a calculated encounter with Manon, the daughter of Count Libelle, shifts all their fates in a direction that even Akari never could have predicted. Just what will become of the Executioner and her seemingly unkillable target...?

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, one of the Four Major Human Errors begins to unfold in the undeveloped regions of the East and slowly inches toward them, leaving a trail of destruction in its wake...

FORCING...FORCING...The past Shio left behind....LOVE...The past Satou left behind....TO LIVE.The two girls are so close......and yet their tales remain hidden in their hearts....LONELY.

The duel with Master Flare in the land of salt continues. Menou should have the upper hand now that she’s linked with Akari and her immense supply of Guiding Force, yet reality suggests otherwise. Master Flare still has a few secrets up her sleeve, and she’ll do anything to win. Meanwhile, a mysterious entity that’s hidden in the Star Memory for centuries emerges, ready to enact a plan one thousand years in the making. Menou and Akari have managed to triumph over every challenge set before them thus far, but they’ve never faced anything like what’s coming. Not everyone will escape alive this time...

A group of "workers" whose better judgement has been clouded by hopes and expectations have descended into the unknown depths of a mysterious tomb. These trespassers include the small but elite team Foresight, the storied warriors of Heavy Masher, the crew lead by a legendary elder worker, Green Leaf, and the invincible swordsmen of Angel. They are some of the best that can be hired, but as more and more vengeful residents of Nazarrick appear, will any make it out alive?