Melty Blood

Tohno Shiki hears of a new series of murders in Misaki similar to the ones that took place in Tsukihime. Whilst searching for the murderer he meets Sion Eltnam Atlasia who initiates a fight with him, attempting to capture him.

After the fight she reveals that her reason for attempting to capture him is to get in contact with the "True Ancestor" (referring to Arcueid) so that she may acquire information on the "cure for vampirism". Shiki then decides to help her with this task.