Joe Tsunado is a private investigator who has been out of work for a long time. Suddenly he gets a call from Yorimasa Kiryuuin, a very rich man, who wants to hire Joe for examing the true identity of one suspicious Yorimasa’s relative. That person appeared after the former head of family had passed out and said that he was his son. Now he claim’s to the fortune of the family and Yorimasa wants to know is he’s really his relative or not.

[From asenheim]