In this episode, the Sket Dan is faced with rumors of a DVD that curses whoever watches it. However, they're too distracted to act upon it because a client called Kuramoto Yumi comes in, asking them to help cheer up her friend. However, this friend, Kaoru Yagi, is not very forthcoming as to the reason for her glum attitude. Then, it turns out that the rumor had some significance, and it is discovered that Kaoru watched a DVD that she shouldn't have.
However, there was a reason behind not watching the DVD that didn't involve the supernatural. The entire case turns out to have started with a Japanese History teacher named Yoshimura, who supervises the Broadcasting Club. He had actually created a DVD containing the questions and answers to an important math exam, and had been planning to sell these answers to any student willing to pay. What he hadn't counted on was his DVD accidentally being switched by one created by Kaoru. Therefore, he blackmailed her into submission and silence, which was finally broken when the Sket Dan broadcasted his confession for the entire school to hear. In the end, Yagi had finally managed to cheer up... slightly.