Cartagra Tsuki Gurui no Yamai Vol. 2 カルタグラ ツキ狂イノ病

The hero of this story is Takashiro Shugo. An ex-police officer that is now unemployed and freeloading at a brothel. From time to time he takes on detective work from his former superior. This time Takashiro is hired to be the bodyguard and detective of a rich actress named Kohzuki Kazuna, who wants to go to Tokyo to find her long lost twin sister Kohzuki Yura (whom the family already has said is dead). The strange thing is that Yura was Takashiro's lover in the past!. Meanwhile there are gruesome serial murders that are occurring in the town...Shugo is no longer able to turn a blind eye and is dragged into the spiraling web of events since those gruesome murders seem to be connected to him...