What kind of title is this?: Manga.
How many volumes are there?: 7 volumes are listed.
How many chapters are there?: 47 chapters are listed.
Where can I read it?: Reading links are listed for Yen Press, Official Site. Check availability in your region.

Synopsis

About The Executioner and Her Way of Life

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 would-be-killer! (Source: Yen Press)

Action Adventure Drama Fantasy