Aoi, who works at a securities company, had a mistress relationship with Makoto Kasai, the scion of Kasai Electric. At first she was an extension of her work, but gradually she was attracted to his charm... One night, Makoto gives her confidential documents about her new product. She refuses that she is cheating, but she receives it unintentionally because of her sincere sincerity, saying, "I want you to be useful." Then, the next day, it was announced that a large amount of Kasai Electric stocks, whose stock prices were rising, had already been purchased under the name of Aoi. The unfamiliar Aoi is asked by the prosecutor's office to voluntarily accompany her as an important witness for insider trading.
