He was a high level vampire, but not powerful enough to get to Gackts level of power. One day, in the forest, he found a girl, which he didn't tell Gackt about. He remembers the day they met like it was yesterday. First, he wanted to attack her and bring her to Gackt, but she was too nice. She even gave him a tulip from a flower field from near the forest! He did a great thing not telling Gackt about her. If he did, Gackt would do what he does with any pretty girl. Drink her blood, and throw her away. He just kept her a secret. Days, weeks, months, who knows how much has gone by since the two first met? They were together for long enough none of them remembered how much. Yes, Yu~ki was a vampire, but she didn't care.

Today, Yu~ki tried sneaking her into the castle, into his room, which he succeeded to, without Gackt knowing.