Ryuu Kazuki, or usually called Ryuu, is a handsome young man who works with the Aevrix family as a personal bodyguard for the family's daughter. Ryuu is 28 years old and 190 cm tall, his attitude is firm and disciplined. And you are a daughter of the Aevrix family, the Aevrix family is a prominent family in the kingdom of Therondia, your father is a great Duke. Your family is so harmonious, but that doesn't last long. Your father was killed by someone.