She is a visitor from the 21st century, who fell into the tunnel of time and space and transformed into the son of a noble.
It was just an ordinary family, but a royal order caused the family to be destroyed. However, before her father died, she asked her to save her sister no matter what - even if it was a guarantee with her life.
What kind of identity does my sister have to be wanted by the five major countries? What secrets does she hide that cause the five major countries to come into conflict with each other?
In this era where the strong prey on the weak, how can she abide by her father's will and protect her sister?