Age: 16
Height: 165cm
Likes: Cooking
Weakness: Jokes
Birth place: Kou Empire

Hakuei's younger brother, he is currently the fourth prince in the Kou Empire. As he was taught to be able to do everything on his own by his sister, he is good at cooking. Because of Hakuei taking over his mother's position, he treasures her a lot as she is his one and only last kin.

He has a serious personality and worries over little things.

Hakuryuu is the owner of the Djinn, Zagan. He is a Dungeon Capturer, capturing one Dungeon, and a King Candidate.
Hakuryuu has a very troubled past. When Hakuryuu was younger, he was in a large fire during a revolt where his father and two brothers were killed. To save his life, his older brother, Hakuyuu Ren, splashed his blood all over Hakuryuu's body after telling to him that the culprit of the fire was their mother, Gyokuen Ren. The incident still caused him to receive the burn scar on the left side of his face. After the revolt, Gyokuen told Hakuryuu and his older sister, Hakuei Ren, that the new Emperor, his uncle, Koutoku Ren, will adopt them and they will still have the title of prince and princess. Soon after, Hakuryuu, not believing what his brother had said, asks his mother about the truth. She admits it and says that she will marry the new Emperor. Later, Hakuei asks him what's wrong and he lies telling her nothing is wrong, hiding the truth about their mother, believing he had to protect her.
Hakuryuu deeply likes Morgiana, after finding out her background and getting to know each other. He liked her enough that he proposed to her and promised to make her his empress. He said he will never give up until she loves him back, declaring he will come back to propose to her.