Kidou Senshi Cross Bone Gundam: Ghost is set in the year UC 0153—two decades after the Cross Bone Gundam series and in the story timeframe of the Kidou Senshi V Gundam anime. The first Cross Bone Gundam series followed the conflict between the burgeoning Jupiter Empire and a small resistance force in UC 0133. Kidou Senshi Cross Bone Gundam Skull Heart and Koutetsu no Nananin show the aftermath of the conflict three years later.

(Source: ANN)