Yakan Hikou: Vampire Knight

A high school freshman named Hana Usagi resides with her stepbrother Yui in a house called "The Mansion of Tragedy." Though she sees herself as a normal student, she goes on nightly walks seeking revenge for her parents' deaths. Her stepbrother frequently requests a taste of her blood. The story explores the dynamics between humans and vampires, blending elements of love and mystery in a dark fantasy setting.