Kouhei meets a vampire girl named Hazuki at an old German castle, and she follows him home to Japan in order to look for her mother, but the two are constantly at battle over her unethical use of her vampire powers and embroiled in mysterious adventures.
This is the volume I like the most of all of them. Here we get Elfriede's personal history which is actually really interesting and we get to see Elfriede's relationship with Grandpa develop. Elfriede's history was sad and kind of beautiful. Definitely liked it.