Yue knew Hajime’s stance. But, in Yue’s eyes, “enemy” that should be killed and the Black Dragon weren’t the same thing. Because she was the ruler of the Vampire race, having experienced such things, her eyes wouldn’t be mistaken about a person. In Yue’s eyes, there were no essence of “enemy” inside the Black Dragon’s mind. For Yue, she at least didn’t want Hajime to kill things other than the “enemy,”
After all,