The Gundam Astray Mirage Frame is a strengthened and redesigned MBF-P05 Gundam Astray Unit 5, the fifth prototype Gundam Astray that was thought to be lost during the collapse of Heliopolis. Unlike the other four prototype Gundam Astrays, the Mirage Frame is equipped with Variable Phase Shift (VPS) armor instead of foaming metal armor and it is also applied to the exposed frame. This VPS armor can be utilized alongside a special Mirage Colloid system to alter the suit's appearance. For example, Gina used this ability to disguise the Mirage Frame as MBF-P01 Gundam Astray Gold Frame.

The Mirage Frame specializes in close combat and incorporated combat data that the Librarian Works collected on the MBF-P03third Gundam Astray Blue Frame Third. It is armed with the "Amenohabakiri" katana that is similar to the "Gerbera Straight" katana of the MBF-P02 Gundam Astray Red Frame but has VPS technology applied to it, triple blades called A Swords on its feet, beam-cannon equipped large blades known as B Swords on its forearms, and the same "Igelstellung" 75mm multi-barrel CIWS and beam sabers as the other prototype Gundam Astrays.