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 iscertain is that they bring disaster and calamity. The duty of exterminating themwithout remorse falls to Menou, a young Executioner.

When she meets Akari, itseems like just another job...until she discovers it''s impossible to kill thisgirl! 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 changeMenou forever...