Zero is haunted by nightmares of his past and the night his family was slaughtered. The episode introduces the shocking reveal that his twin brother, Ichiru , is still alive and serving Shizuka as her bodyguard.
The tenth episode of Vampire Knight , titled (or "The Dark Princess"), focuses on the Arrival of a mysterious new figure and deepening tensions within Cross Academy. Key Story Developments
For a fan's perspective and commentary on these reveals, you can watch this reaction video: Watching Vampire Knight pt. 10: Sweet Brotherly Love ItMustBeK8 YouTube• Jan 9, 2022
The episode builds on the tragic history of the Kiryu family. Shizuka Hio attacked them out of revenge because Zero's parents, who were vampire hunters, had killed her human lover—whom she had turned into a vampire.