Ginjiro Manda, a moneylender in the Minami district of Osaka, is informed by wealthy man Yazaki that he is marrying former hostess Kaori. He lures her sympathy by deceiving her that she has only two years to live, and pretends to have arranged the marriage. At the same time, there are a number of scams in Minami by a malicious black money dealer from Tokyo. When one of his customers falls victim, Ginjiro sets out to investigate and find out what is really going on.