Sei

セイ

Sei holds the title of Dragon King of the East, or "Ryuuou", and is frequently addressed as "Ryuu-dono" as a mark of respect. He also carries the titles of prosecutor of the east and young emissary. He commands the night in Hong Kong and the Special Zone, safeguarding both Red Blood and Black Blood. He is a direct descendant of a chaotic bloodline. Sei also established the barrier and enacted the restrictions that protect the Special Zone. His eyes serve as the "switch" for opening and closing the barrier. When he opens his eyes, the barrier opens, and vice versa. He can transform into a massive golden dragon composed of pure energy. Prior to the story's beginning, Sei appeared to be in his early twenties. At some point within the last ten years, he was reborn as a young child. Despite being reborn into such an adorable form (as Jirou describes it), Sei remains serious and ranks among the most powerful vampires in the narrative, earning him significant respect. He can easily unsettle a vampire with his potent aura. He also has an older sister known as the Dark Princess of the North.