Аріма Міяко

Shiki's non-blood related cousin who became friends with him when he was staying away from the Tohno family ever since the events of eight years ago. She is annoyed at the lack of contact she has had since the events of Tsukihime, and attempts to 'rescue' him from the Tohno family in Melty Blood. However, this triggers a side of Kohaku that should not be awakened. - Wikipedia