The gang pays a visit to the planet Akka Sakka, a giant theme park. However, while Hatchi enjoys himself to the fullest, Robby and Ikku find themselves overwhelmed by the planet's ruthlessly-enforced regulations on negative speech.

The crew make a stop at the industrial world of Yokkamarché, where they meet the man who gave Robby's father the Nagaya Voyager and the Hizakuriger robot. Robby receives a startling revelation about a member of his family.