In a future era stretching over thousands of years, humanity has expanded to other planets spanning the galaxy, rendering Earth's memory obsolete. Among the female space pirates and their massive Sol Bianca vessel in a remote galaxy sector, an unexpected presence emerges in the form of a young girl named Mayo, who has clandestinely boarded the ship. The crew sets out to Earth to unravel the mystery of Mayo's missing parents and to divulge the concealed secrets of the forgotten planet.