Arthur, a boy who traveled through time into the body of a baby in another world.
This is a world with magical powers. People in this world are divided into three, six or nine grades, but he is just a commoner at the lowest level.
How could he be willing to live an ordinary life for the sake of his mother and his dreams?
Moreover, when he came into this world and was named Arthur, he was destined to have an inextricable relationship with the King of Knights.
He has always held the idea that if there is something in the empire, there will be something in the harem.
In fact, this is the story of a man with the same name as the King of Knights, who built his own Crystal Palace in another world.
This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.