Strike the Blood, (Light Novel) Vol. 07

Why is Nagisa so terrified of demons? How did Kojou become the strongest vampire in existence? The answers lie in the sibling's past during an encounter with the twelfth Kaleid Blood and previous Fourth Primogenitor, Avrora Florestina. With only hazy memories of that event, Nagisa now lives a mostly normal life... until she abruptly collapse at school! As Kojou rushes to the hospital, a mysterious girl attacks him... and shelooks just like Avrora!