A renovation contractor named Iwasaki Noriko appears before Yamada Ichiro. She tries to persuade him to sign a contract, but Yamada is not interested, so she becomes fed up and seduces him. Yamada is suspicious, but goes along with the temptation, and is satisfied by Noriko's intense sex and transfers the money. Yamada later realizes that he has been tricked, but he cannot forget the sex he had with Noriko that day. Using his connections, he finds out that Iwasaki is a fake name and that her real name is Nakameguro Junko.