Kyuketsuki no Oshigoto

is a Japanese light novel series written by Suzu Suzuki, with illustrations by Yu Katase. The series began publication on April 10, 2002 by ASCII Media Works under their Dengeki Bunko publishing imprint.

The series won an Honorable Mention in the 8th Dengeki Novel Prize.

Synopsis
Ryofumi Tsukishima, who lives in Yugasaki-cho, is an ordinary young man who earns his living expenses by working at night, and he is a vampire. Along with the familiar cat Tsuki, he was living a peaceful life. Mai Yukimura, a ghost girl who suddenly appeared there, and Lerena, a sister. The two girls who have settled in the Tsukishima family as if they were living, get Ryoji involved in a number of uproar. In addition, an unidentified monster appears ...