No Blood Twintail Shurai!

is a Japanese light novel series written by Fumiaki Fuse, with illustrations by Takanobu Aida. The series began publication on November 10, 2009 by ASCII Media Works under their Dengeki Bunko publishing imprint.

Synopsis
A beautiful blonde vampire has arrived! -Yuya Kusaka, a vampire who couldn't drink blood and was living peaceful days as a normal high school student.

In the city where he lives, a serial murder by a vampire occurs. An agent came from the United States to investigate. It's a non-standard look and behavior of a pigtail & knee high runaway beautiful girl vampire! She calls herself Rizet and takes advantage of the timid Yuya and forcibly begins to live in his house. Yuya, who is confused by Rizet's behavior but tries to live a normal life, is approached by a neat and clean lady student of her classmate.

Is it the beginning of a harem or an overture to hell?