Opoona is the story of a boy who is a descendant of brave warriors, known as Cosmo Guards. These Cosmo Guards strive to maintain universal peace. During a trip to the planet Landroll, Opoona becomes separated from his family. His brother and sister are missing, while his parents are hospitalized with serious injuries. In order to search for his siblings, Opoona must get a job and a license to travel between colonies. Thus, Opoona's adventure begins as he struggles to establish a life for himself on this new planet. Opoona is a lifestyle RPG. The player must adapt to a new environment, meet new people, get a job, all while becoming aware of the precious world and people surrounding him.