While on an interplanetary family vacation, the young boy Opoona crash lands on Planet Landroll after his spaceship is involved in a mysterious accident. Separated from his family, Opoona is forced to live alone. On the planet, Opoona must find a job, search for his siblings, and defend himself and the people of Landroll against creatures known as the Dark Rogues. Luckily for Opoona, he is the descendant of a long line of warriors known as the Cosmo Guards. Thus, Opoona's adventure begins as he struggles to establish a new life and reunite his family.