Aoi, who works at a securities firm, is having an affair with Kasai Makoto, the heir to Kasai Electric. At first it was just an extension of work, but she gradually finds herself drawn to him... One night, Makoto hands her confidential documents about a new product. She refuses, saying it's illegal, but Makoto's sincerity and desire to "use it," causes her to accept it without thinking. The next day, it is announced that a large amount of Kasai Electric shares, the share price of which is on the rise, have already been purchased under Aoi's name. Aoi, who has no recollection of this, is asked to voluntarily accompany the prosecutors as a key witness in an insider trading case...