Is Advance of Zeta connected to Ecole du Ciel or Char’s Deleted Affair?
No. Although Advance of Zeta takes place over the same time span as the manga serial Ecole du Ciel, neither story contains any references to the events and characters of the other. The manga serial Char’s Deleted Affair takes place between the original Mobile Suit Gundam and the Gundam 0083 video series, and has no connection to Advance of Zeta.