Masahiro Toda

The story revolves around a company called "Office AIR Cleaning" who specialize in providing a unique break-up service for those causing trouble to others due to their selfish in-house extramarital affairs.

The story begins in April 1986 and is set during the days of the bubble economy. Kaidou Akira comes from a wealthy background and is the heir of a large company Tokai Yuusen. On the other hand, his genius classmate from the University of Tokyo, Yamazaki Akira had a tough life due to the bankruptcy of his father's company and having to run away from creditors but overcomes the odds to graduatefrom the top-notch school. The two are employed at the same bank and get caught in a battle lasting over 10 years which causes upheavals in their lives.

A wave of gruesome murders is sweeping Tokyo. The only connection is a bloody X carved into the neck of each of the victims. In each case, the murderer is found near the victim and remembers nothing of the crime. Detective Takabe and psychologist Sakuma are called in to figure out the connection, but their investigation goes nowhere...