One day, student council president Kaede is called to the club room after class by her twin sister Suzu. Confused, she meets the secretary of the student council, Hayato. Since her sister hasn't given them any instructions, they don't know what to do. However, there is a strange box with a hole in it in front of them. Without further ado, Kaede decides to reach in to see what it is all about. But it soon turns out that it was just a trap set by her sister ... and her hands are now tied to the table with a rope! Of course, Hayato doesn't need to be told twice ...