He was born as a child of a serf in a world where magic and demons exist - Leurus had memories of a previous life lived in modern Japan.
However, the knowledge of his previous life is of little use in a world where common sense and environment are different from those of his previous life.
Poor housing, hard work, and unsatisfactory food.
Nevertheless, Leurus survived by relying on the experiences of his previous life, and at the age of fifteen, he came of age and was sold into slavery.
However, while being transported to the mines as a slave, Leurus is attacked by a demon and narrowly escapes.
He has no family or friends to rely on, no home to live in, and no food or money to eat. Nevertheless, he is able to gain his freedom and take his first steps into the new world.
He arrives at a town run by people who are not much different from him in terms of circumstances - Laval Waste City.
In the city where he has memories of his previous life, Reurus can only think of it as a slum, and he begins his life as an adventurer.
All Leurus wants to do is to live.
In order to live out his second life, he has to start living in a strange and painful world.