The Executioner and Her Way of Life Vol. 1 (manga)

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!