This is considered episode 26 of the series which was only included on the final DVD. It primarily focuses on the aftermath of the final TV episode (25).

The second season of Mobile Suit Gundam: the Witch from Mercury. A.S.122… An era when a multitude of corporations have entered space and built a huge economic system. After transferring to the Asticassia School of Technology from the planet Mercury, Suletta Mercury has experienced a school life filled with encounters and excitement, as both Miorine […]

The cyborgs are no longer on duty, they live normal lives until a mysterious space ship lands on earth. The only survivor on the ship warns about an evil conqueror called Zoa that wants to conquer the universe, which means the cyborgs are back in action… (Source: Anime News Network)

The year is 2068. Conflict between the Windermere Kingdom and the New U.N. Government has been quelled by Hayate’s Valkyrie squad and Tactical Sound Unit Walküre. Walküre holds a concert to celebrate the ceasefire in Windermere, but a mysterious Heimdall battleship appears and attacks the village. (Source: Disney+)