With Yang closing in from one side, and the Luna Guard closing in from the other, Robby and Hatchi flee Isekandar in the Nagaya Voyager, and discover another of Dontsu's secrets. As both factions give chase, can they return to Earth safely?

The trio stops off on the planet Odwarla, an ocean planet inhabited by merfolk for lunch. When Hatchi is reluctant to use his Smartbracelet, he and Ikku end up having to work off the cost of their meal, while Robby gets food poisoning.

Robby and Hatchi are delighted to finally arrive on Isekandar, and are soon overwhelmed by the number of souvenir shops around the Great Temple of Isekandar. Ikku, however, remains cynical of everything going on around them.

When Robby and Hatchi reach Haccone, they are unable to pass the checkpoint because they lack travel permits. While contemplate their next move, they visit the planet below and enjoy the hot springs, where they learn of a possible solution.

Robby and Hatchi visit Hamama II, home of the Great Eel Festival. Little do they know that Yang and his gang have tracked them there, where they are also enjoying the festivities, as Yang is affected by the eels' legendary powers of virility!

Low on fuel, Robby and Hatchi find themselves on Mulberry 8, a world where mechanical people are in charge and living beings are slaves. The two must learn to navigate the feudalistic society and adapt to anti-human discrimination.

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.

While fleeing Yang, Robby and Hatchi run low on fuel, and must make an emergency stop on Mars. Once there, they enjoy the hospitality of the octopus-like Martian people, but the pair soon stumble upon their shocking secret.

The long journey thus far has taken a psychological toll, and when it is revealed that they may be turned away from Isekandar, pent-up tensions erupt between Robby and Hatchi. Yang and his crew bide their time on the planet Pinopendio.

As Robby and Hatchi try to figure out why Hizakuriger is aboard their ship, they are force to land on Pluto. There, the pair are asked to do for Pluto what they did for Mars, only this time, there is another ad agency already on the case.

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.

Robby Yarge, a man who comes from wealth but has little luck in life, has a chance encounter with Hatchi Kita, a brilliant young man who is tired of the predictability of his life, and the two begin an adventure toward the world of Isekandar.