Cartagra: Tsuki Gurui no Yamai

Takashiro Shugo is a former policeman who currently has no steady income. However, from time to time he performs detective tasks for his former boss.

As the story progresses, Takashiro is tasked with finding a missing woman named Kozuki Yura. He finds out that this is his ex-lover. In the process of searching, he encounters a series of mysterious murders that turn out to be related to Kozuki Yura.